题目

I ______ while reading the English textbook. Luckily, my roommate woke me up in time ! A. had fallen asleep       B. have fallen asleep       C. fell asleep    D. fall asleep 答案:C 解析: 根据woke(wake 的过去式)可以判断,这里谈论的与“现在”无关,因此可以排除B和D两项。I是在读书期间睡着的(while reading),而不是在之前睡着的,所以A项也是不恰当的。
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