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题库 / Prep2007E2-SC-58
If current trends continue, by the year 2010 carbon emissions in the United States will soar to a level more than one-third higher than were those in 1990, according to official projections.
will soar to a level more than one-third higher than were those
will soar to a level more than one-third higher than that
would soar to a level more than one-third higher than it was
would soar to a level more than one-third higher than those
would soar to a level more than one-third higher than they were
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考察：虚拟语气、比较结构
A. 比较结构为level higher (is) than were emissions
不合逻辑，且如果than前无be动词，than后最好也不要有were
B. 比较结构为level (is) higher than level (was)
合理
C. 想讨论的是真实情况，不该用虚拟语气。
D. 同C，those指代emissions不合逻辑
E 同C， they完全指代emissions不合逻辑
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