请教个英语题

更新时间2019-06-07 21:45:23

while I was in the university,I learned taking a photo,___ is very useful now for me.
A.it B.which C.that D.what
这道题为什么选B?

非限定性定语从句，it是另一个主语了，要用that或which来做主语成分

但是前面有逗号，所以必须选which

所以选  B

相关标签:英语