then what I know yesterday, I would have saved myself a lot of timeand trouble over the years.

Câu hỏi :

            then what I know yesterday, I would have saved myself a lot of timeand trouble over the years.

A. Had I known 

B. Did I know 

C. If I know

D.If I would know

* Đáp án

* Hướng dẫn giải

Chọn đáp án A

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