Customers are asked to make sure that they ___ the right change before leaving the shop.

问题描述:

Customers are asked to make sure that they ___ the right change before leaving the shop.
A.will give B.have been given  C.have given D.will be given
为什么不是D不是将会被给与呢

此句强调的是完成动作,离开之前先完成被give的动作.
老师祝你学习进步!
望采纳,多谢!^_^