题文
It is the most instructive lecture that I ___ since I came to this school.
| A．attended |
| B．had attended |
| C．am attending |
| D．have attened |
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It is the most instructive lecture that I ___ since I came to this school.
| A．attended |
| B．had attended |
| C．am attending |
| D．have attened |
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