He ________ more than 5, 000 English words when he entered the university at the age of 15.


  1. A.
    has learned
  2. B.
    would have learned
  3. C.
    learned
  4. D.
    had learned
D
解析：
解析：根據(jù)句中 when引導(dǎo)的時間狀語從句知“entered”為一般過去時，而“學(xué)習(xí)五千多個英語單詞”明顯發(fā)生在“入大學(xué)”之前，故主句時態(tài)應(yīng)為過去完成時．命題立意：本題考查了動詞的時態(tài)．要把握每個時態(tài)的具體意義．過去完成時表示“過去的過去”；
現(xiàn)在完成時強調(diào)對現(xiàn)在的影響；
一般過去時態(tài)是說明一個過去的事實；
而過去將來完成時表示在過去某個時候?qū)l(fā)生的事情．
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