问题描述:
Mary is so wet.She ___in the lake.
A.can have fallen B.must have fallen
C.had to fall D.needed to fall 为什么不选A,can不是情态动词?表示可能性
A.can have fallen B.must have fallen
C.had to fall D.needed to fall 为什么不选A,can不是情态动词?表示可能性
问题解答:
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