I’m ___ duty today. I must clean the classroom _____ school.
A．a(chǎn)fter; onB．in; beforeC．on; afterD．for; in
C  
            
試題分析: 句意：我今天值班，我必須放學(xué)后把教室打掃干凈。on duty值班，after school放學(xué)后，故答案選C.
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