Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đầy đủ đáp án (Đề 2)

pollution control measures are expensive, many industries hesitate to adopt them.       A. Although      B. However     C. Because       D. On account of

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________ pollution control measures are expensive, many industries hesitate to adopt them.

Although

However

Because

On account of

Giải thích

Đáp án: C