单项选择题

He looked as if he ______ ill for a long time.

A．was
B．were
C．has been
D．had been
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单项选择题
If it ______ another ten minutes, the game would have been called off.
A．had rained
B．would have rained
C．have seen
D．rained
单项选择题
— Has Jack finished his homework yet — I have no idea; he ______ it this morning.
A．was doing
B．had been doing
C．has done
D．did
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