问题
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
B:lie; must happen
C:lay; might have happened
D:had lain; could have happen
正确答案是：
同类题型
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