____ 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之間構成主動關系，故使用現(xiàn)在分詞的形式。因為多次失敗是在謂語動詞之前就發(fā)生的，所以使用完成式。句意：已經(jīng)多次失敗，這個年輕的科學家仍然還在堅持做實驗。故A正確。
點評：考查分詞做狀語。當分詞做狀語的時候，如果構成分詞的動詞與句子的主語構成主動關系，就使用現(xiàn)在分詞做狀語；當二者構成被動關系，使用過去分詞做狀語。如果分詞的動作發(fā)生在謂語動詞之前，就使用分詞的完成式。如果分詞與句子的主語沒有關系，可以使用狀語從句或者獨立主格結(jié)構。
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