If you had joined the chat room ten minutes ago, you _____________what we were talking about.  
A．would knowB．would have knownC．knewD．had known
B
考查虛擬語(yǔ)氣。句意“would+have+done”表示對(duì)過(guò)去事情的假設(shè)，意思是“本來(lái)會(huì)做”。如果你十分鐘前加入聊天室，你就會(huì)知道我們正在談?wù)撌裁戳�。“would+have+done”表示對(duì)過(guò)去事情的假設(shè)，意思是“本來(lái)會(huì)做”。故選B。
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