问题
选择题
I didn’t hear the telephone. I _______ asleep.[ ]
A. must be
B. must have fallen
C. would have been
D. should have fallen
答案
答案：B
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I didn’t hear the telephone. I _______ asleep.[ ]
A. must be
B. must have fallen
C. would have been
D. should have fallen
答案：B