there was an epidemic approaching, Mr. smith the invitation to vis

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问题 ______ there was an epidemic approaching, Mr. smith ______ the invitation to visit that area.

选项 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

答案 D

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______ there was an epidemic approaching, Mr. smith ______ the invitation to vis