.-----I asleep while I was reading.-------It doesn’t matter.A. should have fallenB. must h

问题补充：

.-----I asleep while I was reading.

-------It doesn’t matter.

A. should have fallen

B. must have fallen

C. could fall

D. must fall

答案：

A. should have fallen

(答案→)B. must have fallen

C. could fall

D. must fall

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