摘要：The teacher called on me, and I didn't know the answer. （老师叫我回答问题，但我不知道答案。）[剑桥学术内容词典]

1. call on someone,[在班级或学术交流场合] 叫某人回答问题，如

【例句1】I now call upon the chairman to address the meeting. （我现在请主席在会议上发言。）[牛津高级学者辞典]

【例句2】The teacher called on me, and I didn't know the answer. （老师叫我回答问题，但我不知道答案。）[剑桥学术内容词典]

2. call on someone/someplace, 拜访某人/地，如

【例句3】Let's call on James on the way home. （让我们在回家的路上去拜访詹姆斯。）[朗文当代英语词典]

【例句4】Sofia was intending to call on Miss Kitts. （索菲亚打算去拜访基茨小姐。）[柯林斯高级学者辞典]

3. call on something, 利用某物[以实现目的], 如

【例句5】She would have to call on all her strength if she was to survive the next few months. (如果她想在接下来的几个月里活下来，她就必须用尽全力。)[剑桥高级学者辞典]

4. call on someone to do, [正式]请求某人去做，如

【例句6】They're calling on all men and boys over the age of 14 to join the army. (他们呼吁所有14岁以上的男性和男孩参军。) [剑桥高级学者辞典]

【例句7】I now call on everyone to raise a glass to the happy couple. (我现在呼吁大家为这对幸福的夫妇举杯。)[剑桥高级学者辞典]

【例句8】One of Kenya's leading churchmen has called on the government to resign. (肯尼亚一位主要的神职人员呼吁政府辞职。) [V P n to-inf] [柯林斯高级学者辞典]

【例句9】She called on the government to hold a vote. (她呼吁政府举行投票。)[牛津高级学者辞典]

5. call on someone, [浪漫地]追某人，如

【例句10】That boy has been calling on you ever since you were in middle school! I think you're going to end up together. （从你上中学起，那个男孩就一直在追你！我想你们最终会在一起。）

【例句11】Someone left a valentine in your locker? Ooh, I wonder who's calling on you! (有人把情人节礼物忘在你的储物柜里了？哦，我想知道是谁在追你！)

来源：楚天教育