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

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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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