选B,
原因是：首先,后半句应该是定语从句,先行词是5:30 ,在从句中中作时间状语,应该用连接副词when也引导,这时可能你会说when=介词+which,为什么不选A
原因是：从句中时态用had left,也就是过去完成时,如果句子用过去完成时,那么时间状语应该是 by+ which= when
I remainded in the office until 5:30 ___all the others had l
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