18．_____ in the business world for three months，Dora got tired of it and decided to turn to teaching．（　�。�
A．To workB．WorkingC．WorkedD．Having worked

分析 句意：已經(jīng)在生意場(chǎng)上工作了三個(gè)月，Dora覺(jué)得厭倦了它，并決定轉(zhuǎn)向教學(xué)．

解答 答案D．分析句子結(jié)構(gòu)可知，逗號(hào)之后是主句，主語(yǔ)是"Dora"，逗號(hào)之前是非謂語(yǔ)動(dòng)詞形式，主語(yǔ)"Dora"與所給動(dòng)詞"work"構(gòu)成邏輯上的主動(dòng)關(guān)系，應(yīng)該用現(xiàn)在分詞從而排除A和C項(xiàng)．再根據(jù)"in the business world for three months"可知，"在生意場(chǎng)上工作"動(dòng)作先于"決定轉(zhuǎn)向教學(xué)"發(fā)生，應(yīng)該用現(xiàn)在分詞的完成式作狀語(yǔ)，從而排除B項(xiàng)，因此D項(xiàng)符合語(yǔ)境，故選D．

點(diǎn)評(píng) 本題考查非謂語(yǔ)動(dòng)詞用法．做這類題目首先根據(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，看動(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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