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This room is big enough for us to live in.This room is big enough for us to live (in).句子后面为什么要加in?

题目详情
This room is big enough for us to live in.
This room is big enough for us to live (in).句子后面为什么要加in?
▼优质解答
答案和解析
固定搭配的掉尾介词不能省去