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?

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)