_out many approaches,they failed to solve the problem A.Tried B.Trying C.To try D.Having tried

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_out many approaches,they failed to solve the problem A.Tried B.Trying C.To try D.Having tried
_out many approaches,they failed to solve the problem A.Tried B.Trying C.To try D.Having tried

_out many approaches,they failed to solve the problem A.Tried B.Trying C.To try D.Having tried
D
现在分词短语作状语,由于try out...和逻辑主语they 为主动关系,故用现在分词.再由于try out .是先于谓语动词failed 发生的,所以用现在分词的完成式Having tried out.

选d
楼主可能弄不懂的是现在分词的完成式和不定式完成式的区别吧。这两者都表示某动作发生在谓语动作以前,但现在分词的完成式的完成式一般只作壮语,而不定式的完成式则用作除壮语以外的其他成分,在谓语复合结构中尤为多见。
eg. having studied hard during the term, he passed the exam.
he is said to ...

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选d
楼主可能弄不懂的是现在分词的完成式和不定式完成式的区别吧。这两者都表示某动作发生在谓语动作以前,但现在分词的完成式的完成式一般只作壮语,而不定式的完成式则用作除壮语以外的其他成分,在谓语复合结构中尤为多见。
eg. having studied hard during the term, he passed the exam.
he is said to have studied hard and passed the exam.

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