Most anti-virus programs are scheduled to perform a background check_____ throug

游客2025-06-18 18

问题 Most anti-virus programs are scheduled to perform a background check_____ throughout the day on a set schedule.

选项 A、periodically
B、periodic
C、periodical
D、period

答案 A

解析在一个完整的句子之后修饰句中某一动词的词语，必须是副词。因此本题选择periodically。

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