We all know that doing morning exercises .
A. is good for our healthy
B. are good for our healthy
C. are good for our health
D. is good for our health
网友回答
A. is good for our healthy
B. are good for our healthy
C. are good for our health
(答案→)D. is good for our health
解析：for后面健康应为名词，抽象事物一般用单数形式，所以选D。