Mr. Smith suggested the problem worth paying attention ______ at the meeting.
A.to be discussed
B.to being discussed
C.being discussed
D.be discussed
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A解析考查句子结构和语态。形容词短语：worth paying attention to修饰名词the problem.suggest（建议）后面的宾语从句使用虚拟语气should+动词原形，should可以省略本题的be discussed前面就省略了should。根据句意说明应该使用被动语态。句意：斯密斯先生建议值得注意的那个问题应该在会议上被讨论。故A正确。