单项选择题
In the dark they could not see anything clear, but could ______.
A．hear somebody mourn
B．hear somebody mourning
C．hear somebody mourned
D．hear somebody, had been mourning
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单项选择题
______ there was an epidemic approaching, Mr. smith ______ the invitation to visit that area.
A．If he knew, would have declined
B．If he had known, would decline
C．Had he known, would decline
D．Had he known, would have declined
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单项选择题
By the end of the year 2004, he ______ in the army for 40 years.
A．will have served
B．will serve
C．will be serving
D．will be served
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