Not until he left home ________ the importance of his family.A．he realisedB．did he realiseC．he did

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• 按照下图的方法，取2个大小相同的萝卜，各从顶端向下挖一个大小相同的洞，在A萝卜洞内装上浓盐水，在B萝卜洞内装上清水，过一段时间后，观察萝卜洞内水位的变化并注意用手摸-七年级生物
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