单选题
He did his best to stay awake, but the performance was so boring that he just ______ to sleep.
A、
dropped away
B、
dropped out
C、
dropped off
D、
dropped down
【正确答案】
C
【答案解析】
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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