Question

2. Why have you stopped      ,Kitty? The singing competition is coming soon!

   A. to practice to sing   B. to practice singing 

    C. practicing to sing   D. practicing singing

Answer 1

2. D

句意:基蒂，你为什么停止练习唱歌了？歌唱比赛不久就到了！stop to do sth.停下来去做另一件事；stop doing sth.停止做某事；practice doing sth.练习做某事。由句意可知选D。