I____she_____in the room. A.think ; isn't B.don't think ; is C.not think ; is D.don't think ; isn't

句意为：我认为她不在屋子里
我想你知道否定前缀吧!要把后面的否定词移到前面来!
应该选B抱歉，我不知道否定前缀，你能大概讲讲吗：什么时候要用否定前缀？是“否定前置”当think, believe, suppose, expect, fancy, imagine等动词后面宾语从句的否定词转移到主句中，即主句的谓语动词用否定式，而从句的谓语动词用肯定式。 　　例如：I don't think I know you. 我想我并不认识你。 　　I don' t believe he will come. 我相信他不回来。 　　注意：若谓语动词为hope,宾语从句中的否定词不能转移。 　　例如：I hope you weren't ill. 我想你没有生病吧。