20 Đề thi giữa học kì 1 môn Tiếng Anh lớp 9 Đề 14

He is carrying out a research on how people spend their money for clothes. → A research

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He is carrying out a research on how people spend their money for clothes.

  A research_______________________________________________________________________

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Giải thích

A research on how people spend their money for clothes is being carried out.