问题
选择题
The small grocer was at the ______ of the people he owed money to.
A．expense
B．cost
C．mercy
D．sight
答案
答案：C
at the mercy of“任凭……摆布，受……支配”；at the expense of“有……负担，以……为牺牲”；at the cost of “以……为代价”；at the sight of“一看到……就……”。