---How can I keep healthy?---I think you ought to______

试题详情及答案解析: ---How can I keep healthy?
---I think you ought to_________.
A.do more exercise
B. doing more exercise
C. exercising more; 答案：A; 试题分析：句意:——我怎么才能保持健康？——我认为你应该进行更多的锻炼。ought to应该，应当，情态动词，后面接动词原形。根据语意故选A。
考点：考查动词。