2. 专升本
  3. 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.

admin2007-12-30  87
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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