Some student from our class is not coming —— time.后面跟什么介词?

Some student from our class is not coming —— time.后面跟什么介词?
Some student from our class is not coming —— time.后面跟什么介词?

Some student from our class is not coming —— time.后面跟什么介词?
on
on time的意思是 按时
你这个句子的意思是我们班上的某个（注意不是某些）同学没有按时到达.
some student 是某个同学,因为student是单数,后面的is也是单数.