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
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科目：初中英語 來源：0103 期中題 題型：單選題

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

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