____ several times, the young scientist still kept on doing his experiments.
A．Having failedB．Having been failedC．FailedD．To fail
A

試題分析：考查分詞做狀語。本題的fail與句子的后足浴the young scientist之間構(gòu)成主動(dòng)關(guān)系，故使用現(xiàn)在分詞的形式。因?yàn)槎啻问∈窃谥^語動(dòng)詞之前就發(fā)生的，所以使用完成式。句意：已經(jīng)多次失敗，這個(gè)年輕的科學(xué)家仍然還在堅(jiān)持做實(shí)驗(yàn)。故A正確。
點(diǎn)評：考查分詞做狀語。當(dāng)分詞做狀語的時(shí)候，如果構(gòu)成分詞的動(dòng)詞與句子的主語構(gòu)成主動(dòng)關(guān)系，就使用現(xiàn)在分詞做狀語；當(dāng)二者構(gòu)成被動(dòng)關(guān)系，使用過去分詞做狀語。如果分詞的動(dòng)作發(fā)生在謂語動(dòng)詞之前，就使用分詞的完成式。如果分詞與句子的主語沒有關(guān)系，可以使用狀語從句或者獨(dú)立主格結(jié)構(gòu)。
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