on school night还是nights on school day还是days
问题描述：
on school night还是nights on school day还是days
答
on school night 表示“在上学的晚上”,night前面有修饰词,所以用介词on.
at night 表示“在晚上,在夜间”,是固定搭配.on school night还是nights是nights住校生一般从周一到周五都要住校。