Why do you often take exercise?- me keep fit.A. HelpB. HelpingC. To helpD. helped

问题补充：

--- Why do you often take exercise? --- me keep fit.

A. Help

B. Helping

C. To help

D. helped

答案：

(答案→)A. Help

B. Helping

C. To help

D. helped

解析：根据语境可知此题考查的固定结构是help sb do sth表达的意思帮助某人做某事。此句的含义是你为何经常做锻炼啊，为了帮助保存身体健康啊？故选A。