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两道困惑题,求解答

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发表于 2011-8-26 13:15:03 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
The period when the great painted caves at L and A were occupied by UP peoples has been established by carbon dating, but what is more difficult to determine is the use to which primitive peoples put the caves, the reasons for their decoration, and the meaning of the magnificently depicted animals.   the use前面为什么用的是is不是are
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