After a hard ---fought campaign, Barack Obama won the US presidential election, and became

                 President of the United States---the first African –American in           

country’s history to do so.

       A．the; the     B．/; /     C．/; the  D．the; /

After a hard ---fought campaign, Barack Obama won the US presidential election, and became
President of the United States---the first African –American in           
country’s history to do so.