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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

    D


    解析:

    此题容易误选C,学生见到过去时间点，就会依据平时的经验选择一般过去时。其实此题应选D。掌握了5000多个单词并非在15岁上大学时发生，而是早在之前就完成了，过去的过去， 所以要用过去完成时。此句话的汉语意思是：在他15岁上大学时，就已经掌握了5000多个单词了。

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