游客
题文

— 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
科目 英语   题型 单选题   难度 中等
知识点: 主语+系动词+表语 谓语
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