I asleep because it took me a long time to realize that the telephone was ringing.　　　　　　　

I asleep because it took me a long time to realize that the telephone was ringing.　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　
A. could fall
B. need have fallen
C. must have fallen 　
D. may fall

A. could fall B. need have fallen(答案→)C. must have fallen 　 D. may fall解析：考查情态动词表示推测的用法。must have done 表示对过去事情肯定的推测，句意：我当时一定是睡着了，因为花了我好长一段时间才意识到电话正在响。故选C。

和我的回答一样，看来我也对了

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