()not only he but also his friends been to New York?

就近原则啊，呵呵，挨着谁近谁就是主语啊

所以要用has。

如果是陈述句就要用have了。

have

has
not only..but also 是就近原则

选A,就近原则就是跟这个谓语动词近的那个,用什么自己判断。但是有时候一个句型不见得是就近，所以要注意区分。

have

Have
谓语动词的数应与but also后主语的数保持一致：
Not only you but also Mr Zhang teaches in this college. 不仅你，张老师也在此学院教书。