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Barrack Obama __________ President of the United States since 2010.
A.became aB.has become aC.has turnedD.has been
D

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。
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