初中英语题 定语从句
问题描述：
初中英语题 定语从句
1,do you see the building over which flew a red flag,从句中主语可省略?
2,the boy (from whom\against whom)the patient is leaning is his son.
3.a plane is a machine (in which\which)you can travel everywhere.
答
2.against whom.lean against是固定搭配,倚着……