As students,we__________ study very hard for our future．填must还是should?

题目

As students,we__________ study very hard for our future．填must还是should?
这是道单项选择题,请给出详细解释.

答案

填should .should 和must 区别主要体现在语气上．should 更多的是表示意见,而must表示命令.