18．___ about Lucy，the teacher called her parents to find out why she was so often absent from class．（　　）
A．ConcerningB．ConsideringC．ConcernedD．Considered

分析 因為擔(dān)心Lucy，所以老師打電話給她的父母期望他們能協(xié)助找到為什么Lucy經(jīng)常缺課的原因．

解答 答案C．分析句子結(jié)構(gòu)可知，逗號之后是主句，逗號之前是非謂語動詞形式，固定短語"sb be concerned about…某人關(guān)心，擔(dān)心 …"．主句的主語為"the teacher"與所給動詞"concern"構(gòu)成邏輯上的被動關(guān)系，應(yīng)該用過去分詞，表示原因，因此C項符合語境，故選C．

點評 本題考查非謂語動詞用法．做這類題目首先根據(jù)句意判斷是謂語還是非謂語，如果是分詞做狀語的時候，若動詞與邏輯主語構(gòu)成主動關(guān)系，就使用現(xiàn)在分詞的形式；如果二者構(gòu)成被動關(guān)系就使用過去分詞的形式．不定式表示動作未發(fā)生作目的狀語．

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