why not还是why don't?这两个短语到底什么时候用啊?

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• why not还是why don't?这两个短语到底什么时候用啊?
• Why____come with me?A.you B.not C.don't D.aren't 到底是A还是B啊？
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• 已知物体在溶解的过程中,被溶解的物质称为溶质,能溶解其他物质的物质是溶剂.
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