When I was a child, I hoped to live in the city. I think I would be happy there. Now I am living in a city, but I miss my home i

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问题    When I was a child, I hoped to live in the city. I think I would be happy there. Now I am living in a city, but I miss my home in countryside. There the air is clean or the mountains are green. Unfortunately, on the development of industrialization, the environment has been polluted. Lots of studies have been shown that global warming has already become a very seriously problem. The airs we breathe in is getting dirtier and dirtier. Much rare animals are dying out. We must found ways to protect your environment.
   If we fail to do so, we’ll live to regret it.

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答案去掉have后面的been。

解析 主语与动词为主动关系,这里不需要用被动语态。
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