Had you joined the chat room ten minutes ago，you would have known what weabout then．A. had

发布时间：2020-08-16 06:35:53

Had you joined the chat room ten minutes ago，you would have known what we
    about then．
A. had talked
B. have talked
C. talk
D. were talking

网友回答

A. had talked
B. have talked
C. talk
(答案→)D. were talking
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