T he problem of the present world is that those who are imaginative have little experience those who are experienced have weak imagination.
A. unless
B. although
C. because
D. while
网友回答
A. unless
B. although
C. because
(答案→)D. while
解析：本题考查状语从句。句意：当今世界的问题是有想象力的人没有经验而有经验的人缺乏想象力。while然而，表示对比。