15．MaYun _______ an English teacher in a university for 5years before he started Alibaba．（　�。�
A．will beB．isC．has beenD．had been

分析 在他創(chuàng)辦阿里巴巴之前，馬云在一所大學里當了五年的英語老師．

解答 答案：D
根據(jù)句中的時間狀語從句"before he started Alibaba"使用了一般過去時，可知"馬云在一所大學里當了五年的英語老師"是發(fā)生在過去他創(chuàng)辦阿里巴巴之前；故此處表示發(fā)生在過去之前的動作，應(yīng)使用過去完成時；故選D

點評 本題考查了過去完成時的用法；做本題的關(guān)鍵在于：能根據(jù)句中的時間狀語確定出該動作發(fā)生的時間是在過去某時間之前；另外，還應(yīng)熟練掌握過去完成時及其它各時態(tài)的意義及用法區(qū)別．

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