应该是what do you have on Monday?还是what do you have on Mondays?

如题所述

on mondays 是“每逢周一”的的意思,强调一个时间的循环;on monday只是强调具体的星期一,一个时间点。
what do you have on Monday?意思是你星期一吃什么?
what do you have on Mondays?意思是你每逢周一吃什么?
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