He did his best to stay awake, but the performance was so boring that he just ______ to sleep.

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问题 He did his best to stay awake, but the performance was so boring that he just ______ to sleep.

选项 A、dropped away
B、dropped out
C、dropped off
D、dropped down

答案C

解析短语辨析。本题四个选择项都有drop，很易混淆，drop away(一个一个地)离开，drop down卧倒，顺着 (河流、山坡等)向下移动，drop out掉落，掉出，drop off睡着，根据题意只能选C。

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大学英语六级

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