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：

此題考查了動(dòng)詞的時(shí)態(tài)。主句動(dòng)作的發(fā)生時(shí)間在從句動(dòng)作發(fā)生之前，因此選用過(guò)去完成時(shí)態(tài)。

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