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问题: 英语题,急啊!

In the office I never seem to have time until after5:30p.m.( )many people have gone home.

A.whose time B.that
C.on which D.by which time
为什么选D啊,别的为什么错了啊?

解答:

D答案为定语从句,which后的部分为从句内容."by the time"意为"到某某时间为止".