BarackObama,AfricanAmerica,waselectedas56thPresidentoftheUnitedstates.
A./，theB./， /C.an ， theD.an ， /在线课程C
解析：
前文一个美国黑人是泛指，且词首音素为元音，用不定冠词an，下文第56届美国总统是特指，用定冠词the，选C。
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