Câu hỏi :

He started investigating the case a week ago.

A. He has started been investigating the case for a week.

B. He is investigating the case for a week.

C. He has been investigating the case for a week.

D. He has been investigating the case for a week ago.

* Đáp án

C

* Hướng dẫn giải

He has investigated / has been investigating the case for a week.

Đáp án C.

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