单选题
______there was an epidemic approaching, Mr. Smith ______the invitation to visit that area.
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
【正确答案】
D
【答案解析】
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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