Question

_________ is that I have promised to make friends with the dishonest girl．

1. A.
   The only thing what I regret
2. B.
   What I regret most
3. C.
   All what I really regret most
4. D.
   What that I regret most

Answer 1

B
本题考查主语从句。what一词在引导名词性从句时，含有the thing(person)that之意。因此，A项中的the only thing是多余的，也可把what去掉后改为that；同样，C项的all和D项中的that也是多余的。