摘要：B。解析：句意为“如果你不早起，你上学就会迟到”，if引导条件状语从句，“如果”的意思，符合语境。
以下是50道中考英语条件状语从句、原因状语从句综合训练试题及参考答案解析：
试题
You will be late for school ___ you don't get up early.
A. but B. if C. and D. or
I didn't go to the party yesterday ___ I was too busy.
A. because B. so C. and D. but
___ it rains tomorrow, we won't go to the park.
A. If B. Because C. Although D. When
He didn't come to school ___ he was ill.
A. because of B. because C. if D. so
You can't pass the exam ___ you study hard.
A. if B. unless C. when D. while
___ you are in trouble, you can ask me for help.
A. If B. Because C. Although D. So
I was late for class ___ my bike was broken.
A. because B. because of C. if D. when
___ it is raining heavily, we have to stay at home.
A. Because B. If C. Although D. So
You will succeed ___ you work hard.
A. if B. unless C. though D. until
She didn't come to the meeting ___ she had too much work to do.
A. because B. because of C. so D. but
___ it snows, we will make a snowman.
A. If B. Because C. Although D. Until
I didn't buy the book ___ it was too expensive.
A. because B. so C. and D. but
___ you don't hurry, you'll miss the train.
A. If B. Because C. When D. While
He was late ___ the traffic was heavy.
A. because B. because of C. although D. so
You can't learn English well ___ you don't work hard.
A. if B. unless C. until D. when
___ you feel tired, you should have a rest.
A. If B. Because C. Although D. So
She was late ___ she missed the bus.
A. because B. because of C. if D. when
___ it is sunny tomorrow, we'll go for a picnic.
A. If B. Because C. Although D. So
You won't be healthy ___ you eat more vegetables.
A. if B. unless C. when D. while
He didn't go to school ___ his illness.
A. because B. because of C. if D. so
___ it rains this weekend, we'll stay at home.
A. If B. Because C. Although D. Until
I didn't go to the cinema ___ I had seen the film before.
A. because B. so C. and D. but
___ you don't listen to the teacher, you can't understand the lesson.
A. If B. Because C. When D. While
He was very tired ___ he worked all day.
A. because B. because of C. although D. so
You can't get good grades ___ you study carefully.
A. if B. unless C. until D. when
___ you are free, come to my house and play with me.
A. If B. Because C. Although D. So
She didn't come to school ___ she was ill in bed.
A. because B. because of C. if D. when
___ it is windy, we won't fly kites.
A. If B. Because C. Although D. So
You will be stronger ___ you exercise every day.
A. if B. unless C. though D. until
He didn't go to the party ___ the weather was bad.
A. because B. because of C. so D. but
___ it rains, the ground will be wet.
A. If B. Because C. Although D. Until
I didn't buy the dress ___ it didn't fit me.
A. because B. so C. and D. but
___ you don't finish your homework, you can't watch TV.
A. If B. Because C. When D. While
He was late for school ___ his alarm clock didn't go off.
A. because B. because of C. although D. so
You won't succeed ___ you give up halfway.
A. if B. unless C. until D. when
___ you are thirsty, there is some water in the bottle.
A. If B. Because C. Although D. So
She didn't go to work ___ she had a fever.
A. because B. because of C. if D. when
___ it is cold outside, we should wear warm clothes.
A. Because B. If C. Although D. So
You will feel better ___ you take the medicine.
A. if B. unless C. though D. until
He didn't come to school on time ___ the traffic jam.
A. because B. because of C. if D. so
___ it rains heavily, the river will rise.
A. If B. Because C. Although D. Until
I didn't go to the concert ___ I had no ticket.
A. because B. so C. and D. but
___ you don't study hard, you'll fail the exam.
A. If B. Because C. When D. While
He was very happy ___ he got a present from his parents.
A. because B. because of C. although D. so
You can't drive a car ___ you have a driving license.
A. if B. unless C. until D. when
___ you are hungry, you can have some bread.
A. If B. Because C. Although D. So
She didn't come to the party ___ she was too tired.
A. because B. because of C. if D. when
___ it is cloudy, we may not see the sun.
A. If B. Because C. Although D. So
You will make progress ___ you keep on studying.
A. if B. unless C. though D. until
He didn't go to the park ___ the bad weather.
A. because B. because of C. so D. but
参考答案及解析
B。解析：句意为“如果你不早起，你上学就会迟到”，if引导条件状语从句，“如果”的意思，符合语境。
A。解析：“我昨天没去参加聚会是因为我太忙了”，because引导原因状语从句，解释没去聚会的原因。
A。解析：“如果明天下雨，我们就不去公园了”，if引导条件状语从句，表示假设的情况。
B。解析：“他没来上学是因为他生病了”，because后接句子，引导原因状语从句。because of后接名词、代词或动名词等。
B。解析：“除非你努力学习，否则你不能通过考试”，unless意为“除非”，相当于if...not。
A。解析：“如果你有困难，你可以向我求助”，if引导条件状语从句。
A。解析：“我上课迟到是因为我的自行车坏了”，because引导原因状语从句，说明迟到的原因。
A。解析：“因为雨下得很大，我们不得不待在家里”，because引导原因状语从句，表因果关系。
A。解析：“如果你努力工作，你就会成功”，if引导条件状语从句，符合逻辑。
A。解析：“她没来开会是因为她有太多工作要做”，because引导原因状语从句。
A。解析：“如果下雪，我们就堆雪人”，if引导条件状语从句，表示条件与结果的关系。
A。解析：“我没买那本书是因为它太贵了”，because引导原因状语从句，解释没买书的原因。
A。解析：“如果你不快点，你就会错过火车”，if引导条件状语从句，提醒不快点的后果。
A。解析：“他迟到是因为交通拥堵”，because引导原因状语从句，说明迟到的原因是交通问题。
A。解析：“如果你不努力学习，你就不能学好英语”，if引导条件状语从句，表示假设情况。
A。解析：“如果你觉得累了，你应该休息一下”，if引导条件状语从句，提出假设及相应建议。
A。解析：“她迟到是因为她错过了公交车”，because引导原因状语从句，解释迟到原因。
A。解析：“如果明天天气晴朗，我们就去野餐”，if引导条件状语从句，根据天气情况决定是否去野餐。
B。解析：“除非你多吃蔬菜，否则你不会健康”，unless引导条件状语从句，相当于if...not。
B。解析：“他因为生病没去上学”，because of后接名词短语his illness，表示原因。
A。解析：“如果这个周末下雨，我们就待在家里”，if引导条件状语从句，表示假设的天气情况及相应计划。
A。解析：“我没去看电影是因为我以前看过这部电影了”，because引导原因状语从句，解释没去看电影的原因。
A。解析：“如果你不听老师讲课，你就不能理解这节课”，if引导条件状语从句，说明不听讲的后果。
A。解析：“他很累因为他工作了一整天”，because引导原因状语从句，说明累的原因是工作时间长。
B。解析：“除非你认真学习，否则你不能取得好成绩”，unless引导条件状语从句，强调认真学习是取得好成绩的条件。
A。解析：“如果你有空，来我家和我一起玩”，if引导条件状语从句，表示条件及相应邀请。
A。解析：“她没来上学是因为她卧病在床”，because引导原因状语从句，说明没来上学的原因是生病。
A。解析：“如果刮风，我们就不放风筝了”，if引导条件状语从句，表示根据天气情况决定是否放风筝。
A。解析：“如果你每天锻炼，你就会更强壮”，if引导条件状语从句，说明锻炼与强壮的关系。
A。解析：“他没去参加聚会是因为天气不好”，because引导原因状语从句，解释没去聚会的原因是天气。
A。解析：“如果下雨，地面就会湿”，if引导条件状语从句，表明下雨与地面湿的因果关系。
A。解析：“我没买那件连衣裙是因为它不合身”，because引导原因状语从句，解释没买裙子的原因。
A。解析：“如果你不完成作业，你就不能看电视”，if引导条件状语从句，说明完成作业与看电视的关系。
A。解析：“他上学迟到是因为他的闹钟没响”，because引导原因状语从句，解释迟到的原因是闹钟问题。
A。解析：“如果你半途而废，你就不会成功”，if引导条件状语从句，说明半途而废与不成功的关系。
A。解析：“如果你渴了，瓶子里有一些水”，if引导条件状语从句，表示假设及相应情况。
A。解析：“她没去上班是因为她发烧了”，because引导原因状语从句，说明没上班的原因是发烧。
A。解析：“因为外面很冷，我们应该穿暖和的衣服”，because引导原因状语从句，说明穿暖和衣服的原因是天气冷。
A。解析：“如果你吃了药，你会感觉好一些”，if引导条件状语从句，说明吃药与感觉好的关系。
B。解析：“他没有按时到校是因为交通堵塞”，because of后接名词短语the traffic jam，表示原因。
A。解析：“如果雨下得很大，河水就会上涨”，if引导条件状语从句，表明雨大与河水上涨的关系。
A。解析：“我没去听音乐会是因为我没有票”，because引导原因状语从句，解释没去音乐会的原因。
A。解析：“如果你不努力学习，你就会考试不及格”，if引导条件状语从句，说明学习不努力与考试不及格的关系。
A。解析：“他很高兴因为他收到了父母的礼物”，because引导原因状语从句，说明高兴的原因是收到礼物。
B。解析：“除非你有驾照，否则你不能开车”，unless引导条件状语从句，强调有驾照是开车的条件。
A。解析：“如果你饿了，你可以吃些面包”，if引导条件状语从句，表示假设及相应建议。
A。解析：“她没来参加聚会是因为她太累了”，because引导原因状语从句，解释没来聚会的原因是累。
A。解析：“如果是多云天气，我们可能看不到太阳”，if引导条件状语从句，表示天气情况与能否看到太阳的关系。
A。解析：“如果你继续学习，你就会取得进步”，if引导条件状语从句，说明学习与进步的关系。
B。解析：“他没去公园是因为天气不好”，because of后接名词短语the bad weather，表示原因。
来源：蒙古元素