几道高中英语单选题
1.She brought with her three friends,none of ( )I had ever met before.这里为什么要用whom啊
2.What do you think of teaching,Bob?I find it fun and challenging.It is a job( )you are doing something serious but interesting.为什么用where不用which 我觉得这是定语从句啊
3.（ ）twice,the postman refused to deliver our letters unless we chained our dog.为什么要用Bitten而不是Being bitten