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When the man ________ the forest alone, he lost his way and felt very afraid.
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_______ his father_______ his mother are a teacher. They are in the same school.
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北朝包括的朝代有 ①宋②齐③梁④陈⑤北魏⑥东魏⑦西魏⑧北齐⑨北周 [ ]
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—Hey, it's raining! —Yes, it _____ for about 3 days.
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X趋于无穷时,lim(2x+3/2x+1)^(x+1)等于多少,求详细过程
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