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(   ) 1.1 think people should stop      trees, or the environment will become worse.

A.  cut down

B.   to cut down

C.   cutting down

D.  are cutting down

  l.C stop doing sth.意為"停止正在做的事";stop to do sth.意為"停下來去#S^—件事"。故選C。

題目來源:仁愛英語同步練習簿九年級上下冊 > Topic 3 What can we do at home to protect the environment?

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