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If you ____ the chat room ten minutes ago, you ____ what we were talking about.
A．have joined; will knowB．would join; have known
C．should join; would know D．had joined; would have known
D
考查虛擬語氣。句意：如果你十分鐘以前加入了聊天室，你就會知道我們正在談論什么。結合語境可知條件句中是對過去狀態(tài)的虛擬，故用過去完成時態(tài)，主句中用過去將來完成時態(tài)，“would+have+done”表示對過去事情的假設，意思是“本來會做”。故選D。
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