Chuyên đề 9: Hình thức phân từ
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:______ too much chemical fertilizer on their farm,farmers now have to drink polluted water. A. Having used B. Having been used C. Have used D. Having been using

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______ too much chemical fertilizer on their farm,farmers now have to drink polluted water.

Having used

Having been used

Have used

Having been using

Giải thích

Chọn A