__________ your father __________ watching TV in the evening?
A:Does, likes
B:Does, like
C:Is; Likes
D:Do, likes
若关于x,y的方程组2x-y=mx+my=n的解是x=2y=1,则m-n为( )
下列对全面履行原则理解正确的是( )
①正确履行 ②适当履行
③及时履行 ④恪守信用