He _____ more than 5,000 English words when he entered the university at the age of 15.
| A．has learned | B．would have learned |
| C．learned | D．had learned |
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He _____ more than 5,000 English words when he entered the university at the age of 15.
| A．has learned | B．would have learned |
| C．learned | D．had learned |
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