She broke my bicycle lamp_______; that was why Jane was to blame.

A．accidentally

B．accurately

C．positively

D．deliberately

用待定系数法求方程y"-y=xe^x的特解时，特解应设为( )。

A．y=Ae^-x+Be^x
B．y=(Ax+B)xe^x
C．y=(Ax+B)e^x
D．y=(A+B)xe^x