If you ____ the chat room ten minutes ago, you ____ what we were talking aboutA.have joined; will knowB.would join; have knownC.should join; would knowD.had joined; would have known
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D解析考查虚拟语气。句意：如果你十分钟以前加入了聊天室，你就会知道我们正在谈论什么。结合语境可知条件句中是对过去状态的虚拟，故用过去完成时态，主句中用过去将来完成时态，“would+have+done”表示对过去事情的假设，意思是“本来会做”。故选D。