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39．Peter is busy at school.but he never forgets exercise every day．A．working,doing B．working,to do C．a(chǎn)t work,doing 【查看更多】

 

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Peter is busy _________ at school，but he never forgets _________ exercise every day．

A．working；doing           B．working；to do           C．a(chǎn)t work；doing

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