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Barrack Obama __________ President of the United States since 2010.

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

D

解析試題分析：Barrack Obama自從2010年一直是美國的總統(tǒng)。和since 2010連用，用現(xiàn)在完成時，而且因為是一段時間，所以不能和短暫動詞become連用，所以選D。
考點：考查時態(tài)和動詞

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