I always got an A on maths tests ( )this year .Ain B on C/

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I always got an A on maths tests ( )this year .Ain B on C/

I always got an A on maths tests ( )this year .Ain B on C/
I always got an A on maths tests ( )this year .Ain B on C/

I always got an A on maths tests ( )this year .Ain B on C/
C/.应该不用介词