--- I wonder how long you ____ in Hawaii.

--- Just for the weekend, then I had to attend a conference in Los Angeles.

A．will stay

B．stayed

C．have stayed

D．were staying

设y₁=e^x-e^-xsin2x，y₂=e^-xcos2x+e^x是某二阶常系数非齐次线性方程的两个解，则该方程是______．