Though it was very late they their discussion.A. continued withB. went onC. continued onD

问题补充：

Though it was very late, they their discussion.

A. continued with

B. went on

C. continued on

D. carried on with

答案：

A. continued with

B. went on

C. continued on

(答案→)D. carried on with

解析：在表示继续这一含义时，carry on 是经营, 从事, 忙于的意思；go on 是 继续 的意思；continue 是连续性的继续。句意：尽管非常晚了，但是他们还是继续他们的讨论。结合语境可知下文含有从事某事的含义，故选D。