名词性从句36._____we go swimming every day____us a lot of good.

题目

名词性从句36._____we go swimming every day____us a lot of good.
A.If;do
B.That;do
C.If;does
D.That,does
答案是D,我选的是A
实在是不明白~~
详细的解释,谢谢了

答案

D
我们每天游泳给我们带来很多好处.
如果选择A或C,那么这应该是个主从句,if we go swimming every day是从句,而后面主句...do/does us a lot of good.则没有主语了.
这句话的主语是that we go swimming every day,即是由that引导的从句做主语,这属于第三人称单数形式,所以谓语动词用单数形式does.