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最近答疑时间很多同学问到这题，
A2特别录了影片及引用官方版解释来解决大家疑惑！
GWD-1-Q16:
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
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