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In our company,the secretary never seems to have

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In our company,the secretary never seems to have
time until after 19:00,_______other colleague have gone home.A.whose time.B.which time.C.on which time.D.by which time.为什么which后面还有time,which不就是代词了吗?
by which不就等于when了吗?这个time是不是一定要加,还是可加可不加?
which在定语从句中做定语
牛津高阶which词条有:the postman comes at 6:30 in the morning,at which time(ie when) I am usually fast asleep