第一部分语言知识运用第一节单项填空（共15小题，每小题1分，

第一部分语言知识运用
第一节单项填空（共15小题，每小题1分，满分15分）
21．We work together to achieve our common purpose： world that is safer cleaner and healthier than one we found．

A．the；the

B．a；不填

C．a；the

D．the；不填

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