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    精英家教网 > 高中英语 > 题目详情

    Barrack Obama __________ President of the United States since 2010.

    A．became aB．has become aC．has turnedD．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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