8、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

8、B

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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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