摘要："Up until表持续，强调动作不停止，时间点前直接加，完成时态最合适！"

"He stayed awake up until midnight."（他一直醒着到午夜）

"He stayed awake until midnight."

1️⃣ "The offer was valid up until tonight."
2️⃣ "We had no problems up until tonight."
3️⃣ "She kept the secret up until tonight."

"Up until表持续，
强调动作不停止，
时间点前直接加，
完成时态最合适！"

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来源：开口说英语