The Internet and the effect _______ brought about did a lot of good to our daily life and work.

问题描述:

The Internet and the effect _______ brought about did a lot of good to our daily life and work.
A.that B.what C.whitch D.it
为什么选D?这个不能作为复合句来答吗,感觉像是定语从句还是主语从句什么的

是定语从句,只不过省略了that
The Internet and the effect (that)it brought about did a lot of good to our daily life and work