2. 外语
  3. Students who have registered for this course must take performance tests at monthly ______.

Students who have registered for this course must take performance tests at monthly ______.

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问题 Students who have registered for this course must take performance tests at monthly ______.
选项 A、gaps
B、standard
C、length
D、intervals
答案D
解析 名词与搭配。at intervals不时；相隔一定的距离，到处：There are houses at intervals along the road．沿着公路到处都有房屋。相关搭配：at regular intervals每隔一段时间；每隔一段距离
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大学英语四级

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