How many times ____ you ____ that international conference?

Câu hỏi :

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

A. did – attend

B. do - attend

C. have - been attending

D. have - attended

* Đáp án

D

* Hướng dẫn giải

Đáp án D

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