It is necessary______for students to take tests at monthly.

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问题 It is necessary______for students to take tests at monthly.

选项 A、intervals
B、times
C、periods
D、terms

答案A

解析 本题考查的是名词用法辨析。intervals意为“间隔”;times意为“次数”;periods意为“时期”;terms意为“期限”。月与月之间“monthly”应当用intervals,表间隔,故选A。
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