单项选择题

Compared with last year, the output of the factory this year has increased（）20%.

A.with  
B.at   
C.for  
D.by

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Come and see me if you have time.（）

A.I can't.  
B.I'll think it over.
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Chinese is spoken by the（）number of people in the world.

A.smallest 
B.most 
C.largest 
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