The Chinese government has decided to develop the west of china,___,Idare say ,will benfit both the people there and in other places, especially those who are leading a  poor life
A.what    B.whatever    C.which   D.that
为什么不选B，而选C

The Chinese government has decided to develop the west of china,___,Idare say ,will benfit both the people there and in other places, especially those who are leading a poor life
A.what B.whatever C.which D.that
在这个句子当中，I daresay 是插入语。which 作 will benifit both the people there...得主语.
which 引导的是非限定性定语从句，which指前边那件事。意思是西部开发将会使那里的人受益。