摘要：If you had joined the chat room ten minutes ago , you would have known what we were talking about!
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If you had joined the chat room ten minutes ago, you ______what we were talking about!
A. have known B. knew C. would have known D. would know
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If you had joined the chat room ten minutes ago, you _____________what we were talking about.
A. would know B. would have known C. knew D. had known
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If you had joined the chat room ten minutes ago, you _____ what we were talking about.
A. will know B. are knowing C. can know D. would have known
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