However, it only appears in the imagination and will never be .
A. realized
B. supported
C. understood
D. produced
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(答案→)A. realized
B. supported
C. understood
D. produced
解析：A. realized 实现B. supported 支持C. understood 理解D. produced产生；句意：然而，它仅仅出现在想象中并且将永远不可能实现。故选A.