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Customers are asked to make

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
 
正确答案B。考查宾语从句中时态兼语态。“找零”动作发生在“离开”之前，故用完成时。现在完成时表示某个动作或过程在过去某个时间已经开始，现在已经完成或可能继续延续下去。