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In the office I never seem to have time until after5:30pm,__

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In the office I never seem to have time until after5:30pm,____many people have gone home.
when和by which time 填哪个
y which time
因为定语从句是现在完成时
请在客户端右上角评价点“满意”即可
再问: 如果不是现在完成时2个就都可以用了么?
再答: 你这样想有点像套公式, 其实主要看从句的意思来定,好多变数。
再问: 哦 by which time 是在现在完成时中用的 是么
再答: by 常和完成时连用