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To keep our classroom clean, please     

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To keep our classroom clean, please                 waste paper whenever you see it.
[     ]
A. take up        
B. pick up        
C. put up        
D. send up
To keep our classroom clean, please     
B
Our classroom must ______ clean eve We have to stay in the classroom  to wait  for our please,  please  please.  阅读理解.      Encouraging pupils to keep no ......   , .,.  -)  ...  ..