问题描述：
___________ the classroom,the students went to the playground to watch the football match. A.
___________ the classroom,the students went to the playground to watch the football match.
A.To clean B.Having cleaned C.Cleaned D.Cleaning
___________ the classroom,the students went to the playground to watch the football match.
A.To clean B.Having cleaned C.Cleaned D.Cleaning
问题解答：
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