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I'm sorry ____ so long,I forgot to tell you in advance where

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I'm sorry ____ so long,I forgot to tell you in advance where I had put my key.
  A.to keep you wait B.to keep you waiting
  C.to keep you waited D.to have kept you waiting
为什么选D
I'm sorry ____ so long,I forgot to tell you in advance where
因为"让对方一直等着"是先于谓语I'm sorry "对不起"发生的,所以用不定式的完成式,形式为:
to have done sth