单选题
She did her best to stay awake, but the performance was so boring that she just _____ to sleep.无
A、
dropped in
B、
dropped out
C、
dropped off
D、
dropped down
【正确答案】
C
【答案解析】
句意：她竭尽全力保持清醒， 但是表演实在太无聊， 她就睡着了。 drop off to sleep为固定搭配， 意为“睡过去”。
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