2. 外语
  3. Not until the beginning of the twentieth century did the human beings learn to prevent the disease from spreading.

Not until the beginning of the twentieth century did the human beings learn to prevent the disease from spreading.

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问题 Not until the beginning of the twentieth century did the human beings learn to prevent the disease from spreading.
选项
答案直到二十世纪初，人类才学会防止疾病的传播。
解析
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山东省大学英语三级

大学英语三级

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