His mother _______ his father is busy with work.怎么填?

问题描述:

His mother _______ his father is busy with work.怎么填?

His mother _______ his father is busy with work.
句中有is,即为单数,两个人之间填一个介词后,谓语用单数形式,可以考虑or,with
其中or,句意别扭,而with则句意通顺,填with最好