Water pollution is a great________ to be solved now．

A. question B. problem C. matter D. trouble

B 【解析】試題分析：句意：現(xiàn)在水污染是一個很嚴重的需要解決的問題。question主要是用于需要解決的學術(shù)上的問題或是不理解的問題；problem往往是一個事情或一個物件存在的問題；matter主要是翻譯成事情，事件；trouble這個主要是指代麻煩。故選B。
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