题目内容

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
考察虚拟语气的用法。根据If you had joined the chat room可知,该句是表示对过去的虚拟,主句选用would have done结构
句意为,如果你早十分钟进入聊天室的话,你就会知道我吗在讨论什么了。
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