2. 公务员
  3. Because of the noise outside，Nancy had great difficulty______(集中注意力在实验上)．

Because of the noise outside，Nancy had great difficulty______(集中注意力在实验上)．

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问题 Because of the noise outside，Nancy had great difficulty______(集中注意力在实验上)．
选项
答案concentrating/focusing herself on the experiment
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