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 are
A． If he knew, would have declinedB. If he had known, would declineC. Had he known, would declineD. Had he known, would have declined
单项选择题
The index of industrial production ______ last year.
A．raised up by 4 per cent
B．rose up with 4 per cent
C．arose up with 4 per cent
D．went up by 4 per cent
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