选D.既然解决了水体污染,就不存在什么问题或麻烦了.
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Water pollution is a great __to be solved in our city now.A.question B.trouble C.proble D.matter
Water pollution is a great __to be solved in our city now.A.question B.trouble C.proble D.matter
英语人气:251 ℃时间:2020-03-29 21:43:25
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