Mr. Hung ____________ in the army from 1970 to 1980.

Câu hỏi :

Mr. Hung ____________ in the army from 1970 to 1980.

A. has served

B. had been serving

C. had served

D. served

* Đáp án

* Hướng dẫn giải

ĐÁP ÁN D

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