2. 考研
  3. Medical researchers are painfully aware that there are many problems______(他们至今还没有答案).

Medical researchers are painfully aware that there are many problems______(他们至今还没有答案).

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问题 Medical researchers are painfully aware that there are many problems______(他们至今还没有答案).
选项
答案to which they still have no answers so far
解析
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考研英语一

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