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This is a common mistake ____ students.                  

A. between        B.over             C. among         D. about

This is a common mistake ____ students.                  

A. between        B.over             C. among         D. about

This is a common mistake ____ students.                  

A. between        B.over             C. among         D. about

This is a common mistake ____ students.                  

A. between        B.over             C. among         D. about

This is a common mistake ____ students.                  

A. between        B.over             C. among         D. about