A:occasionally
B:usually
C:eventually
D:possibly
若函数f(x)满足:“对于区间(1,2)上的任意实数x1,x2(x1≠x2),fx2-fx1<x2-x1恒成立”,则称f(x)为完美函数.在下列四个函数中,完美函数是( )
— ________ have you stayed in this hotel?
— Not long, just ________ this Monday.