The problem now is very important.A. being discussedB. discussedC. discussingD. to be discussed

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【题目】The problem ______ now is very important.

A. being discussedB. discussed

C. discussingD. to be discussed

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【答案】A

【解析】

考查非谓语动词。句意：现在正在讨论的问题非常重要。being discussed now做后置定语，修饰the problem，相当于定语从句that/which is being discussed now，表示“正在被……”。故选A。