【正确答案】 D

【答案解析】[听力原文]
   M: Lydia, do you know where we keep the extra rolls of receipt paper for the cash register?
   W: There should be about four or five rolls left. Look in the drawer under the machine.
   M: I searched as best as I could, but the drawer is locked. Do you know who might have the key?
   W: If it's locked, we're out of luck. Only Darren has the key, and he's on his lunch break.
选项A错误。选项B错误，男士在使用收银机。选项C混淆了cash register(收银机)和register(注册，登记)。选项D正确。