It’s disturbing to note how many of crimes we do know about were detected ______, not by systematic inspections or other securit

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问题 It’s disturbing to note how many of crimes we do know about were detected ______, not by systematic inspections or other security procedures.

选项 A、by accident
B、on schedule
C、in general
D、at intervals

答案A

解析 by accident偶然地；on schedule准时，照进度进行；in general一般，大体上； at intervals间歇地，间隔地。

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