Doing morning exercise is of great to your health & consequently you’d better keep on

问题补充：

Doing morning exercise is of great to your health & consequently you’d better keep on it.

A. benefit

B. beneficial

C. benefition

D. useful

答案：

(答案→)A. benefit

B. beneficial

C. benefition

D. useful

解析：be of +名词相当于形容词的作用。本题中be of benefit相当于be beneficial。句意：做早操对你的健康很有益你最好坚持。