Before she moved here, Arlene had been president of the organization

Câu hỏi :

Before she moved here, Arlene had been president of the organization since four years.

A.Before she moved

B.had been

C.president of

D.since

* Đáp án

* Hướng dẫn giải

     Đáp án là D. since => for, for + khoảng thời gian, còn since + mốc thời gian

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