6.The soldier surrendered at last, and then he was the cruel enemy.

A.at the risk of

B. at the costof

C. at the endof

D. at the mercyof

正确答案：D

解析：

6.【翻译】这位士兵最终投降了，然后他就任由残忍的敌人摆布了。［精析】D at the risk of：冒着危险；at the cost of：以为代价;at the end of：在的结尾;at the mercy of：任凭……摆布，任……处置：根据句意可知，选D。

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