摘要：26．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
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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
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