单项选择题

It is imperative that he ______ home immediately.

A. should return
B. ought to return
C. must return
D. would return
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单项选择题
Although ______ before the war, the engine is still in perfect order.
A. building
B. to build
C. built
D. Being built
单项选择题
Looking around the small village, he felt as though he ______ from an evil dream.
A. woke
B. wakes
C. would wake
D. had woken
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