摘要： Be quiet, please. The students a class now. A. have B. had C. are having D. were having

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Be quiet, please. The students _______ a class now.              
[     ]

A. have              
B. had              
C. are having          
D. were having

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Be quiet, please. The students  _______  a class now.             
[     ]
A. have      
B. had     
C. are having
D. were having
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