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英语单项选择求教!_____seemed to have been no trouble for him to have

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英语单项选择求教!
_____seemed to have been no trouble for him to have won the first prize in the fierce competitionA it B there C he D that
There seems to have been ...好像有.

选【B】

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如果本题有什么不明白可以追问,
再问: to have won the first prize in the fierce competition 这个是形式主语吗???
再答: 看错了 选【B】 There seems to have been ... 好像有....
再问: 为什么不能选”It" to have won the first prize in the fierce competition 这句话不可以是形式主语吗???
再答: there be是完成时态的标志,所以这里用there have been。