We have classes on Thursday afternoon.为何用on这里为什么要用on 星期前要用on没错 ,可是后面还有个afternoon啊?而且也没说具体哪天的thursday afternoon.我觉得是不是答案错了 应该选CA.in B.at C./ D.on

We don't have any classes on Sunday.We _____ ___We don't have any classes on Sunday.We _____ _____ classes on Sunday. We have on classes on _______and__________. We don't have to work on Saturday 还是We don't have to work on SaturdaysWe don't have classes on Saturday.还是We don't have classes on Saturdays. We don't have any classes on Friday afternoon.(同义) We__ ___classes on Friday afternoon. We don't have classes on w_____.But I have a lot of homework. We have no classes on w. We ______ (not have) classes on Sundays . 选择（说原因）：We don't have any classes ____ .A.on weekdaysB.on wekkdayC.on weekendsD.on weekend we don't have classes on sundays.中的sunday为什么要加s' We don't have any classes on Sunday.【同义句转换】 on saturday and sunday we don't have any classes 句意是什么, on saturday and sunday we don't have any classes 的意思 on saturday and sunday ,we don't have any classes 的意思是什么 on weekends we don't have any classes的中文意思 on saturday and sunday ,we don't have any classes 的意思 We don't have math classes on Thursday afternoon （ ） Friday afternoon填and还是or We have on classes on ___ and ___ .填空 we don't have any classes on weekends.class为什么要用负数,用单数不行吗