Mary’s friend,Tom,who worked at a gasoline station

Mary's friend,Tom,who worked at a gasoline station
Mary's friend,Peter,who worked at a gasoline station during the summer.为什么who要删去?这是非限定定语从句吗?

如果不去掉的话,主句就缺少谓语了,因为这里peter 是插入语,或者你可以理解为是前面的同位语,去掉后,句子就会变成
Mary's friend who worked at a gasoline station during the summer
这个句子就缺少成分了,所以这里的who 要去掉

我也是这个答案

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