问题描述：
The children climed to the top of the hill,____ they picniced.
A.in which B.on that C.allowed D.agreed
书上给的答案是C,可是怎么翻译,
A.in which B.on that C.allowed D.agreed
书上给的答案是C,可是怎么翻译,
问题解答：
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