英语高手进,动词填空,

问题描述:

英语高手进,动词填空,
Mr Li has promised that he (show) us around his garden at any time.

will show
楼上说的用原型应该指的是虚拟语气的时候吧,常见的单词是suggest,insist之类表示建议、要求等词语,但很显然promise不属于那一类.
还有,“that领导的宾语从句后面的谓语动词用动词原形”,这个怎么可能是规律!