My sister had worked in the bank for five years before she had been sent to Da Nang. A B C D

Câu hỏi :

My sister had worked in the bank for five years before she had been sent to Da Nang.

                              A                             B            C                             D

* Đáp án

* Hướng dẫn giải

Chọn đáp án D (was)

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