Present Perfect Continuous exercises

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Submitted by Anonymous (not verified) on Tue, 01/19/2010 - 12:55.

it is a little annoying the fact that when I use the short forms is incorrect sometimes and other times the use of the long forms is incorrect.. I just want to say that say which of the uses is incorrect and stick to it...

Submitted by al3xandra (not verified) on Wed, 04/07/2010 - 13:13.

english

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