若x1,x2(x1<x2)是方程(x-a)(x-b)= 1(a<b)的两个根,则实数x1,x2,a,b的大小关系为( )
A:x1<x2<a<b
B:x1<a<x2<b
C:x1<a<b<x2
D:a<x1<b<x2
I love singing and dancing. I want to be actor in the future.