Do they work _____ Saturdays and Sundays?No,they _____.We often go to see my grandmother.其中的空格里应填什么?
问题描述：
Do they work _____ Saturdays and Sundays?
No,they _____.We often go to see my grandmother.
其中的空格里应填什么?
答
on,
don't
答
on
don't