I failed in the final examination last term and only then _____ the importance of study.
| A．I realized |
| B．had I realized |
| C．I had realized |
| D．did I realized |
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I failed in the final examination last term and only then _____ the importance of study.
| A．I realized |
| B．had I realized |
| C．I had realized |
| D．did I realized |
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