2. 外语
  3. Once environmental damage is done, ______ (整个系统需要许多年才能恢复)

Once environmental damage is done, ______ (整个系统需要许多年才能恢复)

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问题 Once environmental damage is done, ______ (整个系统需要许多年才能恢复)
选项
答案it takes many years for the system to recover
解析
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大学英语四级

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