2. 外语
  3. More and more new types of energy resources have been exploited ______.(来代替煤和石油)

More and more new types of energy resources have been exploited ______.(来代替煤和石油)

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问题 More and more new types of energy resources have been exploited ______.(来代替煤和石油)
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答案to replace coal and oil
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大学英语四级

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