A. she had written the article on conservation
B. she has written the article on conservation
C. she wrote the article on conservation
D. did she write the article on conservation
A
He asked, Why did she write the article on conservation?
⇒ He asked why she had written the article on conservation.
Dịch: Anh hỏi tại sao cô lại viết bài báo về bảo tồn.
Đáp án A
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