If you the chat room ten minutes ago, you what we were talking about.A. have joined; wil

If you the chat room ten minutes ago, you what we were talking about.
A. have joined; will know
B. would join; have known
C. should join; would know
D. had joined; would have known

A. have joined; will knowB. would join; have knownC. should join; would know (答案→)D. had joined; would have known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。

谢谢了

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