She often her clothes on Sundays. But last Sunday she her clothes.
A:washed; didn't wash
B:washes; didn't wash
C:washes; didn't washed
下面是鸟类适于空中飞行生活的形态结构和生理特点的叙述,其中错误的是( )
如图2所示的四个情景中,人对物体做功的是( )