大学英语作业：( ),mother will wait for him to have dinner together.

这个是however引导的让步状语从句,however有以下用法：
however可以做连词,含义为“不管……如何,多么”,引导让步状语从句.从句的语序为：however+adj./adv.+主语+句子的其他成分.
例如：We shall never succeed,however much we try.
无论我们多么的努力,都不可能成功.
However cold it is,she always goes swimming.
无论天多冷,她总是去游泳.
所以应该选D,其它的语序都不对.

此处 however = no matter how ,however这里是表示“无论怎样”,However +形容词/副词+宾语+谓语动词 故 D 是对的。