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Some scientists say it is essential that mankind______the amount of air pollution in big cities.
Some scientists say it is essential that mankind______the amount of air pollution in big cities.
admin
2007-12-30
43
问题
Some scientists say it is essential that mankind______the amount of air pollution in big cities.
选项
A、reduce
B、reduces
C、reduced
D、must reduce
答案
A
解析
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本试题收录于：
英语题库普高专升本分类
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英语
普高专升本
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