A:can manage
B:could have managed
C:could manage
D:can have managed
如果0<a<1,那么a2、a、1a之间的大小关系是( )。
If you do things ________, usually you can't do them well.
圆的对称轴是圆的半径.
—This term I want to be the top student in my class.
— ______.