Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có lời giải chi tiết (Đề 1)

It’s high time we _______ something about the pollution. A. did B. had done C. made D. had made

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It’s high time we _______ something about the pollution.

did

had done

made

had made

Giải thích

Chọn A