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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
here are a few singular entities that “it” may refer to. These entities are “spending” and “the presidential campaign of 1992”. However, none of these entities are logical antecedent of “it”. Hence, presence of this pronoun makes this sentence incorrect.
from GMAT club 意思就是A中的it是不能指代a great proportion的
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