In the office I never seen to have time until after5.30-many people have gone home.

问题描述:

In the office I never seen to have time until after5.30-many people have gone home.
which time,改为by which可以吗,为什么

by which是对
by +时间 这种形式见过的哟 by which 中which 指代5.30那为什么正确答案还要加个time我认为不要time,你说呢?