The teacher together with his students down at the desk and having a discussion in the cl

问题补充：

The teacher together with his students down at the desk and having a discussion in the classroom.

A. is sitting

B. sat

C. are sitting

D. would sit

答案：

(答案→)A. is sitting

B. sat

C. are sitting

D. would sit

解析：如主语是单数,尽管后面接as well as no less than , with, like, together with , but, expect , besides等引导的词组,谓语还是用单数.