why the problem of pollution befalls human beings这句为什么不是why do the problem of pollution befall human beingswhy 不是要加一般疑问句么~这句为什么加陈述句?那正式写作中可以怎么用么?
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![why the problem of pollution befalls human beings这句为什么不是why do the problem of pollution befall human beingswhy 不是要加一般疑问句么~这句为什么加陈述句?那正式写作中可以怎么用么?](/uploads/image/z/13345720-16-0.jpg?t=why+the+problem+of+pollution+befalls+human+beings%E8%BF%99%E5%8F%A5%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E6%98%AFwhy+do+the+problem+of+pollution+befall+human+beingswhy+%E4%B8%8D%E6%98%AF%E8%A6%81%E5%8A%A0%E4%B8%80%E8%88%AC%E7%96%91%E9%97%AE%E5%8F%A5%E4%B9%88%7E%E8%BF%99%E5%8F%A5%E4%B8%BA%E4%BB%80%E4%B9%88%E5%8A%A0%E9%99%88%E8%BF%B0%E5%8F%A5%3F%E9%82%A3%E6%AD%A3%E5%BC%8F%E5%86%99%E4%BD%9C%E4%B8%AD%E5%8F%AF%E4%BB%A5%E6%80%8E%E4%B9%88%E7%94%A8%E4%B9%88%EF%BC%9F)
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