________ about Lucy, the teacher called her parents to find out why she was so often absent from class．A.ConcerningB.ConsideringC.ConcernedD.Considered
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C解析这道题是考查现在分词和过去分词的用法．现在分词表主动而过去分词表被动．Lucy和concern的关系是被动关系．全句的意思是“老师关心Lucy，所以打电话给她的父母，了解一下为什么她经常不来上课”．