__________then what I know yesterday, I would have saved myself a lot of time and trouble over the years.   

Câu hỏi :

__________then what I know yesterday, I would have saved myself a lot of time and trouble over the years.   

A Had I known 

B Did I know

C If I know    

D If I would know

* Đáp án

A

* Hướng dẫn giải

Phương pháp giải:

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