Nathalie suggested the problem worth paying attention at the meeting.A. to be discussedB.

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A. to be discussed
B. to been discussed
C. being discussed
(答案→)D. be discussed
解析：    
试题分析:考查虚拟语气。suggest当“建议”讲时，后面的宾语从句用虚拟语气，即谓语动词用should+v原型，should可以省略，所以答案选D。句意：娜塔莉建议这个值得注意的问题要在会上进行讨论。