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

游客2025-05-11  3

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
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