问题
选择题
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
答案
答案：D
for后面健康应为名词，抽象事物一般用单数形式，所以选D。
搜题请搜索小程序“爱下问搜题”