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Barrack Obama __________ President of the United States since 2010.

A. became a B. has become a C. has turned D. has been

 

D

【解析】

试题分析:Barrack Obama自从2010年一直是美国的总统。和since 2010连用,用现在完成时,而且因为是一段时间,所以不能和短暂动词become连用,所以选D。

考点:考查时态和动词

 

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