Both and are因为both and连接两个东西谓语动词用复数both and 是都是的意思
Not only but also am 因为not only but also这个词组是就近原则谓语动词根据but also后面的人称来变化,因此下面一道题的答案就是Not only but also is.绝对一个字一个字自己写的,