Not only English but also maths my favourite subject.A. isB. areC. beD. am

问题补充：

Not only English but also maths my favourite subject.

A. is

B. are

C. be

D. am

答案：

(答案→)A. is

B. are

C. be

D. am

解析：句意：不但英语而且数学都是我最喜欢的课程。Not only...but also...连接两个并列成分做主语时，后面谓语动词的单复数遵循就近一致的原则；故选A。