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】

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(shí)，而且因?yàn)槭且欢螘r(shí)間，所以不能和短暫動詞become連用，所以選D。

考點(diǎn)：考查時(shí)態(tài)和動詞

 

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