Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đầy đủ đáp án (Đề 4)
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The assumption that smoking has bad effects on our health have been proved.

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The assumption that smoking has bad effects on our health have been proved.

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Đáp án: The assumption that smoking has bad effects on our health have been proved. has