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?yàn)閾?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(hào)之后是主句，逗號(hào)之前是非謂語(yǔ)動(dòng)詞形式，固定短語(yǔ)"sb be concerned about…某人關(guān)心，擔(dān)心 …"．主句的主語(yǔ)為"the teacher"與所給動(dòng)詞"concern"構(gòu)成邏輯上的被動(dòng)關(guān)系，應(yīng)該用過(guò)去分詞，表示原因，因此C項(xiàng)符合語(yǔ)境，故選C．

點(diǎn)評(píng) 本題考查非謂語(yǔ)動(dòng)詞用法．做這類(lèi)題目首先根據(jù)句意判斷是謂語(yǔ)還是非謂語(yǔ)，如果是分詞做狀語(yǔ)的時(shí)候，若動(dòng)詞與邏輯主語(yǔ)構(gòu)成主動(dòng)關(guān)系，就使用現(xiàn)在分詞的形式；如果二者構(gòu)成被動(dòng)關(guān)系就使用過(guò)去分詞的形式．不定式表示動(dòng)作未發(fā)生作目的狀語(yǔ)．

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