Not only my friend but also I interested in action films. We often see films together.A.

问题补充：

Not only my friend but also I interested in action films. We often see films together.

A. be

B. am

C. is

D. are

答案：

A. be

(答案→)B. am

C. is

D. are

解析：not only … but also 连接两个主语时，谓语动词要和与其最近的主语保持人称和数的一致。