Trắc nghiệm Chuyên đề 6: grammar (find the mistakes) có đáp án
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My sister had worked in the bank for five years before she had been sent to Da Nang. A B C D

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

                              A                             B            C                             D

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Giải thích

Chọn đáp án D (was)