Soaring television costs accounted for more than half the spending in the presidential campaign of 1992, a greater proportion than it was in any previous election.
Soaring television costs accounted for more than half the spending in the presidential campaign of 1992, a greater proportion than it was in any previous election.
A. a greater proportion than it was B. a greater proportion than C. a greater proportion than they have been They 没有指代对象,同时不应使用完成时 D. which is greater than was so which 指代不明 E. which is greater than it has been which 指代不明