—You should be careful when .
—Yes, I will. I’d like to know when to have a rest.
A. driving; stopping
B. driving; to stop
C. to drive; stopping
D. to drive; to stop
网友回答
A. driving; stopping
(答案→)B. driving; to stop
C. to drive; stopping
D. to drive; to stop
解析：本题考查非谓语动词。第一空考查现在分词作状语，drive与逻辑主语you为主动关系；第二空为V + 特殊疑问词 + to do结构。句意：——当开车的时候，你应当小心。——是的，我会的。我想知道什么时候停下来休息会儿。