It’s a shame ______ able to give them any advice.  
A．not to have beenB．to have not beenC．to have been notD．to not have been
A

試題分析：  句意為：很遺憾，未能給他們?nèi)魏谓ㄗh
從語氣上看，此題屬于虛擬語氣。動詞不定式的否定形式在其前加not，可排除B,C,D
點評：此題主要考察考生對動詞不定式的掌握程度和熟練情況�？忌谶M行復(fù)習(xí)時，應(yīng)特別注意此類知識點的活學(xué)活用。
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