500+ câu trắc nghiệm tổng hợp Chia động từ Tiếng Anh có đáp án (Phần 1)
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Before you asked, the letter________ A. was written B. had been written C. had written D. has been written

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Before you asked, the letter________

A. was written

B. had been written

C. had written

D. has been written

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Giải thích

Đáp án

Chọn đáp án B