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,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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