MODULE 22- Đại từ nhân xưng, Đại từ sở hữu và Đại từ phản thân
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________ the problem, he wouldn’t have committed those mistakes. A. Had he understood B. He had understood C. If had he understood D. Unless had he understood

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________ the problem, he wouldn’t have committed those mistakes.

Had he understood

He had understood

If had he understood

Unless had he understood

Giải thích

Chọn đáp án A