In the advanced course, students must take objective tests ______ monthly interv

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问题 In the advanced course, students must take objective tests ______ monthly intervals.

选项 A、with
B、on
C、for
D、at

答案 D

解析句意：在高级课程学习阶段，学生必须每隔一个月参加一次目标性测试。本题考查的是固定词组at interval中的介词at。

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