We work together to achieve our common purpose：world that is safer cleaner and healthier

问题补充：

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

答案：

A. the；the

B. a；不填

(答案→)C. a；the

D. the；不填

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