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We work together to achieve our common purpose: ____ world that is safer, cleaner and healthier than ____ one we founded.

    A. the; the      B. a; 不填       C. a; the       D. the; 不填

We work together to achieve our common purpose: _________world that is safer, cleaner and healthier than ________ one we found.

A. the; the          B. a; /              C. a; the             D. the; /

We work together to achieve our common purpose:____ world that is safer, cleaner and healthier than ____ one we are living in．

　 A．the; the　　 B．a; /　　　　　 C．a; the　　　　　 　　　　 D．the; /

We work together to achieve our common purpose: _________world that is safer, cleaner and healthier than ________ one we found.

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

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

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