Bộ 4 Đề thi Tiếng Anh 11 Học kì 1 có đáp án (Đề 3)
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While I did my homework, I had a good idea.

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Choose the underlined part among A, B, C or D that needs correcting:

While I did my homework, I had a good idea.

did

my homework

had

a

Giải thích

Đáp án là A.