— Who will go to the airport to meet Mary?
— I will. I ________ her several times. I can find her easily.
A:met
B:have met
C:had met
D:will meet
用配方法解方程x2-2x-5=0时,原方程应变形为( )
短暂的计划容易实现,不需要意志的作用。只有完成远大的计划,才需要意志的作用。( )