The question last night was of great importance. A. discussedB. discussingC. to be discus

问题补充：

The question last night was of great importance.

A. discussed

B. discussing

C. to be discussed

D. discuss

答案：

(答案→)A. discussed

B. discussing

C. to be discussed

D. discuss

解析：

discussed是过去分词作后置定语修饰主语question。表示“昨晚讨论的问题。”\