The boy saved the drowning child at the ______ of his own life.

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问题 The boy saved the drowning child at the ______ of his own life.

选项 A、lose
B、expense
C、cost
D、price

答案C

解析 at the cost of是固定结构,表示“以……为代价”。句子意思是:那个男孩为了救这个落水的孩子,付出了生命的代价。
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