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More and more people have realized that we will not have a b

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More and more people have realized that we will not have a better life unless something _____
More and more people have realized that we wonst have a better life unless something____to solve the pollution problem.
a.can be done b.is done
More and more people have realized that we will not have a b
A越来越多的人已经意识到,我们wonst有更好的生活,除非可以做些什么来解决污染问题.
B越来越多的人已经意识到,我们wonst有更好的生活,除非采取措施解决污染问题