_______ he was seriously ill, I wouldn’t have told him the truth.  
A．If I knewB．If I knowC．Had I knownD．Did I know
C
考查含有if條件狀語從句的虛擬語氣。根據(jù)wouldn’t have told，可知指的是過去情況，所以if從句要用過去完成時(shí)態(tài)，即if I had known he was seriously ill,助動詞had可以提到句首，省略if ，構(gòu)成部分倒裝，即had I known he was seriously ill。所以選C。
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