2. 外语
  3. Not until we learned the facts did we realize ______.(噪音污染的危害)

Not until we learned the facts did we realize ______.(噪音污染的危害)

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问题 Not until we learned the facts did we realize ______.(噪音污染的危害)
选项
答案the dangers of noise pollution
解析
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大学英语四级

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