she went to Tsinghua University and majored in English and management

问题描述:

she went to Tsinghua University and majored in English and management
and majored in前面不用and 可不可以,说下为什么

不可以,如果加AND 可以理解成并列谓语,相当于后面省略了主语she的并列句.
因为英语中一句话,严格来说只有一个谓语动词,如果不是如上并列句,那么其它的就要改成分词形式.
没有and ,就是:majoring in