问题补充:
You need fit.
A. exercise keeping
B. to exercise to keep
C. exercising keeping
D. to exercise keeping
答案:
A. exercise keeping
(答案→)B. to exercise to keep
C. exercising keeping
D. to exercise keeping
解析:句意:你需要锻炼来保持健康。动词不定式做宾语表示具体的将要进行的动作,不定式做目的状语也表示具体的将要进行的动作,结合语境可知选B。