A:明朝
B:晚清
C:民国
D:新中国
(1) She bought a ____ (bath) suit last Sunday.(2)I like doing some ____ (shop) at weekends.(3)She hasn't ____ (feed) the cat yet.(4)There are about ten ____ (well) in that village.(5)Has the camera been____ (pack) yet?
一元二次方程x2﹣8x﹣1=0配方后可变形为( )