The boss stressed the criterion that a qualified waiter must do every service ____ the satisfaction of his customers.
A、for
B、by
C、on
D、to
【正确答案】：D
【题目解析】：D 老板强调指出，要做一名合格的服务员必须使自己的服务让顾客满意。本题考察介词的使用。do sth. to the satisfaction of sb. 的意思是“把某事做得使某人满意”，其他三个选项均不合题意。
