为什么he is having lunch at home now.中的having不用hasing?

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为什么he is having lunch at home now.中的having不用hasing?
为什么he is having lunch at home now.中的having不用hasing?

为什么he is having lunch at home now.中的having不用hasing?
一般进行时为be doing 固定结构,怎么会有be doesing?(真要解释的话,固定词组您能改吗)