Jane is a good student.She often hard work.病句改错.

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• Jane is a good student.She often hard work.病句改错.Jane is a good student.She often hard work.请问这句是是哪里错了.often 还是 hard work?
• Jane is a good student.She often hard work.病句改错.
• 1·2·5（ ） 例：1000²=100×100×100(千方百计）
• 20个鸭梨和16个苹果分放两堆，共重11千克，如果从两堆中分别取4个鸭梨和4个苹果相交换，两堆重量就相同了．每个苹果比鸭梨重_千克．