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Whenhesawallhisbooks

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问题详情:

Whenhesawallhisbooks

When he saw all his books _____ here and there on the floor, he knew that something terrible _____.

A. lying; must have happened B. lie; must happen

C. lay; might have happened D. had lain; could have happen

【回答】

A

知识点:动词时态

题型:选择题