单项选择题

In arithmetic the rules of addition are basic, and all the other rules are built on this ()

A. basis      
B. bases    
C. base    
D. basises

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She told them where she()her son.

A. has last seen
B. had last seen
C. last seen
D. was last seeing
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Stop (), boys! It's time for class.

A. talking  
B. to talk    
C. talk     
D. being talk
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