The student asked her professor if he would have gone on the space ship he did k

游客2023-12-31 20

问题 The student asked her professor if he would have gone on the space ship he did know earlier.

选项 A、if he knew
B、if he knows
C、he had known
D、had he known

答案 D

解析本题考查虚拟语气的用法。本句是对过去事实的假设，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提至句首。因此，答案是D。

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