问题描述：
一道英语选择题,请说出选择理由.
The child was lost in the forest, where he was _____ the mercy of wild beasts.
A. at B. on C. for D. in
The child was lost in the forest, where he was _____ the mercy of wild beasts.
A. at B. on C. for D. in
问题解答：
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