题干
——Could I have some snacks between meals, mum?
——No, you __________.
A：couldn't
B：shouldn't
C：can't
D：might not
答案(点此获取答案解析）
C
——Could I have some snacks between meals, mum?
——No, you __________.
A：couldn't
B：shouldn't
C：can't
D：might not
双方，包含着向对立面转化的趋势 
定条件下可以向“进步”转化，体现了矛盾的同一性