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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:602

—The air in Nanjing was much better during the Spring Festival because people were not allowed to let off firecrackers.
—I agree. Everyone should do what he can        the environment.

A.protect B.protecting
C.protects D.to protect
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—TheairinNanjingwasmuchbetterd