The small grocer was at the of the people he owed money to.
A. expense
B. cost
C. mercy
D. sight
网友回答
A. expense
B. cost
(答案→)C. mercy
D. sight
解析：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……”。