When he came back,what are you doing 为什么用when

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When he came back,what are you doing 为什么用when
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When he came back,what are you doing 为什么用when
When he came back,what are you doing 为什么用when

When he came back,what are you doing 为什么用when
当他回来时,你在做什么,主句 what are you doing,“when---”是主句的状语,亦即时间状语从句