If you had joined the chat room ten minutes ago, you ______what we were talking about!
A．have knownB．knewC．would have knownD．would know
C
考察虛擬語氣的用法。根據(jù)If you had joined the chat room可知，該句是表示對過去的虛擬，主句選用would have done結(jié)構(gòu)
句意為，如果你早十分鐘進(jìn)入聊天室的話，你就會知道我嗎在討論什么了。
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