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
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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
单项选择题
Even if his letter ______ tomorrow, it ______ too late to do anything.
A. will arrive... is
B. should arrive... were
C. arrives... will be
D. arrives... would be
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