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There are no easy answers to questions brought to us by the rapidly changing world,        we can try to turn challenges into opportunities．

A．so       B．but                 C．for                D．then

There are no easy answers to questions brought to us by the rapidly changing world, ____ we can try to turn challenges into opportunities.

A. so　　　　　　 B. but　　　　　 C. for　　　　　　 D. then

There are no easy answers to questions brought to us by the rapidly changing world, _______ we can try to turn challenges into opportunities.

A. so　　　　　　　　 B. but　　　　　　　 C. for　　　　　 D. then