_severaltimes...[高三][地理]
收录时间：2021-08-30 答题：高三地理（郑老师）
【题目】____ several times, the young scientist still kept on doing his experiments.
A. Having failed B. Having been failed
C. Failed D. To fail
【答案】A
【解析】分词动作fail与其逻辑主语the young scientist之间是主动关系，故用现在分词作时间状语，又因为现在分词的动作发生在谓语动作之前，故用现在分词的完成时。
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