分类：教育/科学-外语学习
问题：英语1.Isthisflat___youoncelivedin? 
1.Is this flat ___ you once liv in?2.Is this the flat ___ you once lived in?2.Is this the only flat ___ you once lived in?2.Is this the flat in___ you once lived?2.Is it the flat ___ you once lived in?A.which   ere   e one   at先行词作主句的表语时关系代词用THAT,为什么不都选D?第１为什么先1.Is this flat ___ you once liv in?2.Is this the flat ___ you once lived in?2.Is this the only flat ___ you once lived in?2.Is this the flat in___ you once lived?2.Is it the flat ___ you once lived in?A.which   ere   e one   at先行词作主句的表语时关系代词用THAT,为什么不都选D?第１为什么先Ｃ？
回答：选C是因为这句话没有先行词，实际上this flat是这句话的主语，改成陈述句就是this flat is _____ you once lived in.所以选C用the one 作先行词，你说的没错，先行词作主句的表语时关系代词用that，所以如果在the one 后面加上that也是对的。