He more than 5000 English words when he entered the university at the age of 15.
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He ______________ more than 5000 English words when he entered the university at the age of 15.
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A．has learnedB．would have learnedC．learnedD．had learned
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解析：根据句中when引导的时间状语从句知entered为一般过去时，而“学习5000多个英语单词”明显发生在“入大学”之前，故主句时态应为过去完成时。 |