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外语
Most anti-virus programs are scheduled to perform a background check_____ throughout the day on a set schedule.
Most anti-virus programs are scheduled to perform a background check_____ throughout the day on a set schedule.
admin
2011-04-03
56
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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