The question ________ at yesterday’s meeting hasn’t been made ________ yet．
A.discussing; knowB.discussed; knownC.being discussed; knowD.to be discussed; know在线课程B
据推测句意为：昨天在会议上讨论的问题还不为人所知。过去分词(discussed)作定语表示问题已被讨论过。过去分词(known)作主补，表示未为人所知。全句意为：昨天会议上所讨论的问题还不为人所知。