题干
School students _____ smoke because it is bad for their health and it is against the law.
A：needn't
B：couldn't
C：shouldn't
D：may not
答案(点此获取答案解析）
C
School students _____ smoke because it is bad for their health and it is against the law.
A：needn't
B：couldn't
C：shouldn't
D：may not
