单选题：In the advanced course students take performance tests at monthly ___.
选项:
a、gaps
b、intervals
c、length
d、distance
人气：178 ℃ 时间：2020-05-15 15:25:49
解答
b、intervals
根据中文意思：在进阶课程上,学生们每月都要进行技能测试.
可知这里需要一个表示时间间隔的词
interval
n.[C]
间隔;距离[(+between)]
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