----Wake up, Tom. Time to rise. -----I asleep while I was reading. A. should hav
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----Wake up, Tom. Time to rise.
-----I_____ asleep while I was reading.
A. should have fallen B. must have fallen C. could fall D. must fall
试题答案
B
解析:
本题考查情态动词表示猜测。对发生在过去的事情进行可能性极大的猜测，用must have done。