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Look (at) what you've done!

Hi!  Could I ask you this question? 


Practical English Usage (fourth ediction) says that the preposition "at" following the verb "look" is often dropped before a wh-clause.


(1) Look (at) what you've done!


I was wondering whether there is any semantic difference when the preposition is present/absent.  I was also wondering whether the preposition can appear after "look" in the following sentences (taken from  Practical English Usage):


(2) Look who's here!


(3) Look where you're going.


I would appreciate your comments!

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