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    I____ asleep because it took me a long time to realize that the telephone was ringing.
    A．could have fallenB．should have fallen
    C．must have fallenD．mustn’t have fallen
    C
    考查虚拟语气。句意；我肯定是睡着了，因为用了很长时间我猜意识到电话铃一直在响。“must+have+done”表示对过去事情的肯定推测，译成“一定做过某事”。故选C。
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