问题描述：
这个句子用过去分词还是过去式
They don't have to find/found food by themselves.
是用FIND还是FOUND
1楼的,这里是do not （原题） 不是haven't
They don't have to find/found food by themselves.
是用FIND还是FOUND
1楼的,这里是do not （原题） 不是haven't
问题解答：
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