首先你需要明白这句话的主谓结构:Johnson suggested the problem ( ) at the meeting.
worth paying attention to 是定语,修饰the problem
实际上是the problem which is worth paying attention to ,是一个定语从句
而 suggest (that) sb.(should) do sth.故选项一定在A 或 C 中
其次你得搞清楚discuss的主语是problem
问题“被”讨论,所以用被动态be discussed 选A