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题库 / Prep2008E2-SC-197
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 greater proportion than it was
a greater proportion than
a greater proportion than they have been
which is greater than was so
which is greater than it has been
请看讲解视频
a, it没有指代对象，前文出现的只有spending 和 campaign
且，就算不省略，也不能补be动词，前文是account for，应该补do
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