∵m,n是方程x 2-2008x+2009=0的两根,
∴m 2-2008m+2009=0,n 2-2008n+2009=0,mn=2009.
∴(m 2-2007m+2009)(n 2-2007n+2009)=(m-2009+2009)(n-2009+2009)=mn=2009.
故选C.
∵m,n是方程x 2-2008x+2009=0的两根,
∴m 2-2008m+2009=0,n 2-2008n+2009=0,mn=2009.
∴(m 2-2007m+2009)(n 2-2007n+2009)=(m-2009+2009)(n-2009+2009)=mn=2009.
故选C.