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Windows7wascreatedin2009,-----manycomputerloverswereinterested.AwhereBwhen为何选B?求详解我觉得直接beinterested不通,而where等于inwhich,即先行词为windows7

题目详情
Windows 7 was created in 2009,----- many computer lovers were interested .
A where B when 为何选B?求详解
我觉得直接be interested不通,而where等于in which,即先行词为windows7
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答案和解析
因为逗号前面是年,表示时间