单选题
Sales of margarine rose last year ______those of butter.
A、
comparing
B、
at a loss of
C、
at the expense of
D、
due to
【正确答案】
C
【答案解析】
[解析] comparing比较,对照;at a loss of亏本;at the expense of以……为代价;due to由于。故选C项。
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