He could speak English fluently because he __________ it for four years when he was a college student.    
A．had studiedB．have been studyingC．studiedD．was studying
C

試題分析：考查時態(tài)：句意：他的英語可以說的很流利，因為他做大學(xué)生的時候?qū)W習(xí)了四年。說明學(xué)習(xí)英語是在大學(xué)當(dāng)學(xué)生的時候，用過去時。選C。
點評：時態(tài)的考查要根據(jù)本句的關(guān)鍵詞，本題的關(guān)鍵詞是when he was a college student.    
本題特別容易錯選B項。但學(xué)習(xí)的動作發(fā)生在過去已結(jié)束。只能用過去時。
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