On those questions _________ at yesterday’s meeting, all the teachers made their views _________ clearly.A.discussing; knowB.discussed; knowC.discussing; knowingD.discussed; known
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D解析考查过去分词。根据语境可知，“问题”与“讨论”应是被动关系，所以用过去分词的形式；make...known中known作宾语补足语，与宾语也是被动关系。