A:not stay up
B:not to stay up
C:no staying up
变黄的杨树叶能够从树枝上脱落下来,这说明( )
My father ____ (come)back last Sunday.
— ____ is that tall man?
— He is my brother.
下列句子中没有语病的一项是( )
在 -1,0,-2,12这四个数中,最小的数是( )