He is the only one of the students who ______a winner of a scholarship        for three years.                                                         
A．isB．a(chǎn)reC．have beenD．has been
D

試題分析：考察主謂一致和時態(tài)。本題中定語從句的先行詞是the only one，而不是the students，關系代詞who指代先行詞在句中作主語，故謂語動詞要和the only one保持一致，故使用單數(shù)形式。句意：他是三年以來學生中唯一的一個贏得獎學金的人。根據(jù)后面的時間狀語for three years，說明使用現(xiàn)在完成時的時態(tài)。故D正確。
點評：英語中的時態(tài)主要由動詞的形式?jīng)Q定，因此在學習英語時態(tài)時，要注意分析動詞形式及具體語境，想象在那個特定的時間動作所發(fā)生的背景，這個動作是經(jīng)常性動作、一般性動作、進行性動作、完成性動作還是將要發(fā)生的動作。
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