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  3. Tom tried his best to keep awake, but the performance was so boring that he coul

Tom tried his best to keep awake, but the performance was so boring that he coul

游客2023-11-21  121
问题 Tom tried his best to keep awake, but the performance was so boring that he couldn’t help to sleep.
选项 A、dropping off
B、dropping down
C、dropping away
D、dropping out
答案 A
解析 drop off可以有“打盹，打瞌睡”的意思，drop off to sleep则是“睡着”的意思，符合本题的题意。其他三个选项分别是：drop down意为“(使)落下，迅速低下身体等”； drop away意为“陆续离开，逐渐减少等”；drop out意为“退出，退学等”，均不符合本题的题意。
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