______there was an epidemic approaching, Mr. Smith ______the invitation to visit that area.

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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

解析 本题考查的是虚拟语气句型的用法。对过去的情况表示虚拟,从句用过去完成时,主句用would have done。Had he known…相当于If he had known…因此本题答案为D。
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