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He would have attended your birthday party but he ______ himself with a very important experiment.
A. occupied B. has occupied C. had occupied D. has been occupying
He would have attended your birthday party but he _________ himself with a very important experiment.
A.occupied B.has occupied C.had occupied D.has been occupying
He would have attended your birthday party but he ________ himself with a very important experiment.
A.occupied
B.has occupied
C.had occupied
D.has been occupying