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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Topic: Epidemic Diseases and Public Health Crises

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

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