it's shame ___________able to give them any advice.A. not to have been B.to have not been C.to have been not D.to not have been应该选什么,为什么呢~~

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• 问几道初中英语题,麻烦详细解释下,先谢谢了……1.He is running ______now.A.more slowly and more slowlyB.slowier and slowierC.more and more slowly答案给的是C.可是为什么不选B呢?我记得有“比较级+比较级”这个句型啊?2.The sick man was too thin to go any ______.A.farB.fartherC.further答案给的是B,可是B、C都是far的比较级,都可以表示“更远”.为什么不选C呢?3.Miss Smith with her parents ______ China 2 years ago.A.have been inB.has gone toC.has been in答案给的是A,可是既然有with,谓语动词就应该遵循with前面的Miss Smith,应该用单数啊,为什么不选C呢?
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• All the people in this company have been instructed _____ the survey they did yesterday.A,return B.return's C.to return D.to return's 拜托说说原因,为什么选那个,
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