________ he ________ hard last year, he would have lost the first prize.

Câu hỏi :

  ________ he ________ hard last year, he would have lost the first prize.

A Had – not studied 

B Had – studied

C Didn’t – study   

D It – had studied

* Đáp án

A

* Hướng dẫn giải

Phương pháp giải:

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