Some of our clients have complained that the time it takes to get a ______ from a service representative is enough to make them not want to use our services again.
 
【正确答案】 A
【答案解析】 我们的一些客户投诉说，从服务人员处得到答复的时间足以让他们不想再使用我们的服务。本题需选择适当的词形。