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  3. 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.

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问题 I____asleep because it took me a long time to realize that the telephone was ringing.
选项 A、could have fallen
B、should have fallen
C、must have fallen
D、mustn’t have fallen
答案C
解析
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