为什么they go shopping every sunday 中 sunday 前用every而不是用in或on

为什么they go shopping every sunday 中 sunday 前用every而不是用in或on Do you go shopping （ ）every Sunday? A、on B、to C、/ D、in mother () shopping every Sunday.A.go B.going C.goes On Sunday morning,I often go shopping with my mother.为什么用on His mother does some shopping every Sunday.(用now代替every Sund They are watching TV now.(用every Sunday代替now) I go s___ every sunday. Sunday morning前用in还是on? They can go shopping on Sunday.改为同义句 They go to the church every Sunday morning. They go to the movies on Sundays.(用last Sunday 替换on Sunday 改 the children play tennis every Sunday afternoon用next Sunday