HIRAM REVELS, THE FIRST BLACK MEMBER OF THE UNITED STATES SENATE, SERVED AS SENATOR FOR MISSISSIPPI, AN OFFICE _______ HE WAS ELECTED IN 1870

7. Hiram Revels, the first black member of the United States Senate, served as senator for Mississippi, an office _______ he was elected in 1870.A. which B. in which C. and which D. being which