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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
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a it was应改为they were
b 比较内容ratio of television costs in the spending in the presidential campaign 是同一个主体，随着时间的推移而变化，所以可以省略
c they have been应该改为they had been，因为是要和1992这个过去年份之前比较
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