Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đầy đủ đáp án (Đề 3)
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because waste plastic has always been a bigger problem (79) substances like waste paper

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because waste plastic has always been a bigger problem (79) ……………………..….substances like waste paper

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Đáp án:

because waste plastic has always been a bigger problem (79) than substances like waste paper.