He failed this time,which I couldn't expected.他这次失败了,这是我未料想到了.定语从句为否定形式的,只能用which,不能用as.
as 引导的非限制性定语从句,可以在主句之前也可在主句之后,而which 引导的从句只能在主句之后
which 与 as 什么情况下可以互换
He failed this time,which I couldn't expected.他这次失败了,这是我未料想到了.定语从句为否定形式的,只能用which,不能用as.
as 引导的非限制性定语从句,可以在主句之前也可在主句之后,而which 引导的从句只能在主句之后