题文
By the time he was 12 years old, he_______ threedifferent languages.
| A．mastered |
| B．will have mastered |
| C．has mastered |
| D．had mastered |
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By the time he was 12 years old, he_______ threedifferent languages.
| A．mastered |
| B．will have mastered |
| C．has mastered |
| D．had mastered |
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