______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 本题考查虚拟语气。表示对过去情况的虚拟,从句用过去完成时,主句谓语动词用would have done。“Had he known…”相当于“If he had known…”,故答案为[D]项。
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