Question

Barack Obama,          African America, was elected as          56^th President of the United states.

A．/，the

B．/， /

C．an ， the

D．an ， /

Answer 1

C

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。