She had to sell the house even though it was her own wish.A. aboveB. onC. againstD. for

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A. above
B. on
(答案→)C. against
D. for
解析：考查介词辨析。句意“她不得不卖掉房子，尽管这样做违背她的意愿。”above“在......上面”；on“在......上”，与某物有接触；against“违反；靠着”；for“因为；为了”。故选C。