Câu hỏi :

Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.

A. have been looking/haven't found

B. have looked/haven't found

C. have been looking/haven't been finding

D. have looked/haven't been finding

* Đáp án

A

* Hướng dẫn giải

Đáp án A

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