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一道定语从句hemadepeoplelaughatatimewhentheyfeltdepressed,sotheycouldfeelmorecontentwiththeirlives.为什么用when不用which不是已经有借此at了吗

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一道定语从句
he made people laugh at a time when they felt depressed,so they could feel more content with their lives.为什么用when不用which 不是已经有借此at了吗
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答案和解析
所谓at 和which组合是在定语从句中,而此句at并不在定语从句中,所以不可和which联系起来看待.只看先行词是time,从意思上要用when即可.