2. 外语
  3. It may be necessary to stop ______ (每隔……时间) in the learning process and go back to the difficult points in the lessons.

It may be necessary to stop ______ (每隔……时间) in the learning process and go back to the difficult points in the lessons.

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问题 It may be necessary to stop ______ (每隔……时间) in the learning process and go back to the difficult points in the lessons.
选项
答案at intervals
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大学英语六级

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