8.1 stop doing/to do
stop to do 停止,中断做某事后去做另一件事。
stop doing 停止做某事。
  They stop to smoke a cigarette.  他们停下来,抽了根烟。
  I must stop smoking.      我必须戒烟了。

  She reached the top of the hill and stopped ___ on a big rock by the side of the path. 
A. to have rested B. resting  C. to rest D. rest
答案:C。由题意可知,她到了山顶,停下来在一个路边的大石头上休息。因此,应选择"stop to do sth. 停下来去做另一件事"。而不仅仅是爬山动作的终止,所以stop doing sth.不正确。