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题目内容
（中国石油大学-《大学英语4》）
)
In the advanced course students must take performance tests at regular ________.
A)
gaps
B)
intervals
C)
length
D)
distance
In the advanced course students must take performance tests at regular ________.
A)
gaps
B)
intervals
C)
length
D)
distance
参考答案