on a visit有没有on the visit这种说法?为什么要用a?是固定词组搭配还是?

on a visit有没有on the visit这种说法?为什么要用a?是固定词组搭配还是? on a visit还是in a visit ? 有go on a visit的短语,那么come on a visit的说法可以吗 be on a visit for a visit 与on a visit有什么区别 a visit 后加on还是to they ___(visit)a farm on Monday.填visit还是visited为什么 be on a visit to的同义词组是什么? go on a visit to be on a visit to 是plan visit to 还是 plan a visit to 为什么? We will go on a two-day visit to Bejing.为什么要加on.