His uncle works in a factory which makes bicycleswhich可否用that

问题描述:

His uncle works in a factory which makes bicycles
which可否用that

不可以。that不可以代替主语

it's ture.
这是一个定语从句。
makes bicycles 是用来修饰a factory。不做其他类似主语用途。
所以that替换是可以的。

不可以,因为which即做了定语又做了主语。

可以这是定于从句 除了非限定行定于从句任何时候that 都可以替换which

不可以,因为in which =that.