at weekdays和on weekdays有什么区别?该怎样用?

at weekdays和on weekdays有什么区别?该怎样用? on weekdays还是at weekdays on weekdays,at weekdays和on weekday,分别是什么意思?它们的区别分别是什么 weekdays和weekend有什么区别 weekdays前的介词应该是什么?(on.in.at?) I get up at 6:30 on weekdays什么意思 weekdays和weekday的区别 weekday和weekdays的区别? 此题该如何选择填空?On weekdays I like ________(hang out) at the sport They eat lunch at school on weekdays,改一般疑问句 weekdays 前面用 on 还是用 in 还是用 at He seldom does his homework at school on weekdays,__________