_________ is that I have promised to make friends with the dishonest girl．A.The only thing what I regretB.What I regret mostC.All what I really regret mostD.What that I regret most
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B解析本题考查主语从句。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。