If you had joined the chat room ten minutes ago, you _____ what we were talking about.
A．will knowB．are knowing C．can knowD．would have known
D
考查虛擬語氣。根據(jù)語境考查與過去事實相反的虛擬語氣，故主句用would have done。句意：如果你一分鐘之前加入聊天室的話，你就會知道我們在談論什么的。
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