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
考查虛擬語氣。句意；我肯定是睡著了，因為用了很長時間我猜意識到電話鈴一直在響�！癿ust+have+done”表示對過去事情的肯定推測，譯成“一定做過某事”。故選C。
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