Question

(   ) 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

Answer 1

  l.C stop doing sth.意为"停止正在做的事";stop to do sth.意为"停下来去#S^—件事"。故选C。