______ he was seriously ill, I wouldn’t have told him the troth.A、If I knewB、If

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问题 ______ he was seriously ill, I wouldn’t have told him the troth.

选项 A、If I knew
B、If I know
C、Had I known
D、Did I know

答案 C

解析本题考查的是与过去事实相反的虚拟语气。主句用would(might) have done，从句用过去完成时had done形式。从句中省略了if，因此需要部分倒装，将had提前。因此C为正确答案。

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