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______, the teacher dismissed all of them.

A. Having cleaned the classroom
B. Cleaned the classroom
C. After cleaning the classroom
D. After they had cleaned the classroom
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科目：高中英語 來源：專項題 題型：單選題

______, the teacher dismissed all of them.
[     ]
A. Having cleaned the classroom
B. Cleaned the classroom
C. After cleaning the classroom
D. After they had cleaned the classroom

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