Question

【题目】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

Answer 1

【答案】D

【解析】句意：在15岁进入大学的时候他已经学会了5,000多个英语单词。learn这个动作发生在when引导的从句里的动词entered之前，所以要用过去完成时。