Customers are asked to make sure that they______ the right change (零钱) before leaving the shop
A.will giveB.will be givenC.have givenD.have been given在线课程D
考查时态。句意：在离开商店之前，要求顾客确信他们给找给了正确的零钱。结合语境可知下文描述的是某时前完成的动作，故用完成时态。They是动作对象，故用被动语态。选D。