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

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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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。