2. 外语
  3. Only after they had performed hundreds of experiments______(他们才成功地解决了这个问题).

Only after they had performed hundreds of experiments______(他们才成功地解决了这个问题).

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问题 Only after they had performed hundreds of experiments______(他们才成功地解决了这个问题).
选项
答案did they solve the problem successfully
解析
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大学英语四级

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