I _____go there alone,but he ____go there by himself

选择C.这里的dare都用作情态动词
1） dare用作实义动词,此时其后的动词不定式可带to也可不带to,且dare有人称和数以及时态的变化.例如：
I dare to jump down from the top of the wall.我敢从那墙头上跳下来.
She doesn't dare (to) meet her teacher's eyes.她不敢与老师对视.
2） dare用作情态动词,后跟动词原形,主要用于疑问句、否定句和条件句中.例如：
How dare she do things like that to me?她怎么敢对我做那种事?
-Dare you catch the mouse?你敢去抓那只老鼠吗?
-I daren't do that.我不敢抓.

C 如果是情态动词就都直接否定且后面直接加动词,如果是行为动词就要DOESN'T,再接动词就加TO