I failed in the examination last term and only then ____ the importance of studies.
| A．I realized |
| B．I had realized |
| C．had I realized |
| D．did I realize |
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I failed in the examination last term and only then ____ the importance of studies.
| A．I realized |
| B．I had realized |
| C．had I realized |
| D．did I realize |
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