题目内容：

only thing_ is wrong with this is_.
The only thing_ is wrong with this is_a friend of mine said to me the other day.
A.which,what
B.what.that
C.that.what
D.that.which
想问问第二空which不也可以引导表语从句么
百度百科的资料:
连接表语从句的连接词有：that,what,who,when,where,which,why,whether,how.whoever,whomever,whichever ,whatever等

优质解答

The only thing (that is wrong with this) is (what a friend of mine said to me the other day).前句为定语从句the only 后用that,不用which;后句为表语从句what a friend of mine said 我一个朋友所说的,which哪一个、哪些,what which都可引导表语从句,但其意义不同, what为泛指,which则有范围限定.