The teacher asked us ______ the playground after the sports meeting.

A. clean
B. to clean up
C. cleaning up
D. to clean over
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科目：初中英語 來源：江蘇省期中題 題型：單選題

The teacher asked us ______ the playground after the sports meeting.
[     ]
A. clean
B. to clean up
C. cleaning up
D. to clean over

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