He did know the crevice, he could have closed it with a rock at the beginning an

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问题 He did know the crevice, he could have closed it with a rock at the beginning and the fish would have been his.

选项 A、If he knew
B、If he knows
C、He had known
D、Had he known

答案 D

解析本句是对过去情况的假设，条件从句的谓语应用过去完成时(had known)，而if条件句中如有were，should，had，可将if省去，而把were，should，had放在句首。所以选项D为答案。

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