1．________ several times，the young scientist still kept on doing his experiments．（　�。�
A．FailedB．Having been failed
C．Having failedD．To fail

分析 在經(jīng)歷了幾次失敗后，這名年輕的科學(xué)家仍然堅(jiān)持做實(shí)驗(yàn)．

解答 答案是C．本題考查現(xiàn)在分詞完成式；題干中需要的是非謂語動(dòng)詞做時(shí)間狀語，主語the young scientist 和fail之間的主動(dòng)關(guān)系，用現(xiàn)在分詞，排除A和B；動(dòng)詞不定式表示將來，本題中動(dòng)作已經(jīng)發(fā)生，排除D；現(xiàn)在分詞完成式表示分詞的動(dòng)作在謂語動(dòng)詞之前已經(jīng)發(fā)生或完成；根據(jù)語境，"先失敗"，然后才有"繼續(xù)堅(jiān)持"，故用現(xiàn)在分詞完成式，答案是C．

點(diǎn)評 首先判斷選項(xiàng)中的動(dòng)詞在句中是以謂語還是非謂語形式出現(xiàn)，然后根據(jù)選項(xiàng)在句中的功能結(jié)合非謂語的基本用法做出合理的判斷．要關(guān)注常見非謂語動(dòng)詞的搭配．

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