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______ he was seriously ill, I wouldn't have told him the truth.
A、If I knew
B、If I know
C、Had I known
D、Did I know
【正确答案】：C
【题目解析】：要是我知道他病重了，我是不会告诉他真相的。此题考查的是倒装和虚拟语气的综合用法。