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

試題分析：Barrack Obama自從2010年一直是美國(guó)的總統(tǒng)。和since 2010連用，用現(xiàn)在完成時(shí)，而且因?yàn)槭且欢螘r(shí)間，所以不能和短暫動(dòng)詞become連用，所以選D。
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