A:ca
B:shall
C:could
D:should
-- Miss Wang, I'm sorry I am late because I _______ to catch the early bus.
-- It doesn't matter. You'd better come to school earlier next time.
全面建设小康社会必须经济建设、政治建设、文化建设一起抓。因为( )
已知﹣0.5xa+bya﹣b与23xa-1y3是同类项,那么( )