30. He his potential had it not been for his desire to meet new challenges.A. would never

问题补充：

30. He his potential had it not been for his desire to meet new challenges.

A. would never have realized

B. would never realize

C. never realized

D. had never realized

答案：

(答案→)A. would never have realized

B. would never realize

C. never realized

D. had never realized

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