1.B factory在定从中位宾语 又work是不及物动词 需要+介词连接
work in the factory 且in which=where
2.A talk to the man ,man在定从中为宾语 修饰人可有who/that/省略
不能用which
3.D 根据句译 你能借我内本你讨论的书吗?词组talk with sb about sth
4.C 不告诉你的原因 why=for which
5.C 都指代人 且在定从中充当主语 不可省略 另可用that
6.A 根据句译 应该是the house's roof 所以用whose
而C of which使用时必须+定冠词 才可 即 of which the roof