2. 外语
  3. In the advanced course students must take performance tests at monthly ______.

In the advanced course students must take performance tests at monthly ______.

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问题 In the advanced course students must take performance tests at monthly ______.
选项 A、gaps
B、intervals
C、length
D、distance
答案B
解析 interval指时间、空间的“间隔”。At monthly interval“每隔一个月。”at regular interval“每隔一定时间”。 A)项gaps“缝隙”、“缺口”；C)项length“长度”；D)项distance“距离”；“(时间上的)间隔”。
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大学英语四级

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