I ______ asleep because it took me a long time to realize that the telephone was ringing.
A.could have fallen | B.should have fallen |
C.must have fallen | D.mustn’t have fallen |
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I ______ asleep because it took me a long time to realize that the telephone was ringing.
A.could have fallen | B.should have fallen |
C.must have fallen | D.mustn’t have fallen |