2. 外语
  3. All my efforts____________(集中在理解他们的英语上) during those two hours of the day when I was with them.

All my efforts____________(集中在理解他们的英语上) during those two hours of the day when I was with them.

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问题 All my efforts____________(集中在理解他们的英语上) during those two hours of the day when I was with them.
选项
答案were concentrated on understanding their English
解析
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大学英语四级

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