It’s disturbing to note how many of the crimes we do know about were detected ________not by systematic inspections or other sec

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问题 It’s disturbing to note how many of the 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”;on schedule“按时”;in general“通常,大体上”;at intervals“不时”。根据句子结构,所填词与by systematic inspections or other security procedures是对称的,by accident 符合要求。
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