earlier I' d have told you.A. If I would have known itB. Had I known itC. If I knew it.D.

问题补充：

earlier, I d have told you.

A. If I would have known it

B. Had I known it

C. If I knew it.

D. Should I know it

答案：

A. If I would have known it

(答案→)B. Had I known it

C. If I knew it.

D. Should I know it

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