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 |
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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 |
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