that lastest car must have cost you a pretty penny ,oh no_a it didn't b it mustn't c it hasn't d it must haven't求详解106.43（与题无关）
问题描述：
that lastest car must have cost you a pretty penny ,oh no_
a it didn't b it mustn't c it hasn't d it must haven't
求详解
106.43（与题无关）
答
1.have若为助动词（完成时）：肯定句的反问：haven't,hasn't hadn't否定句的反问：have..has..had...have若为实意动词：肯定句的反问：didn't doesn't don't否定句的反问：did..does..do..2.will you省去主语的祈使...