500 Câu trắc nghiệm tổng hợp ngữ pháp Tiếng Anh thi THPT Quốc gia (Phần 7)
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-------------- study hard when you were at school?

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-------------- study hard when you were at school?

Must you

Had you

Did you have to

Were you

Giải thích

Chọn C