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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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原句句子结构：If current trend continue, … carbon emissions … will soar..., according to…
原句逻辑语义：如果目前的趋势继续下去，到2010年碳排放量在美国将飙升至一个水平，这个水平高于1990年的水平三分之一，据官方预测。
A.复数those不能指代单数level，因此只能强制指代前句的复数主语emissions，那么，句子变成将level与emissions相比较，比较对象不对等。
B.正确。
C.主句应该使用will，而不是would。
D.主句应该使用will，而不是would，复数those没有指代对象。
E.主句应该使用will，而不是would，复数they没有指代对象。
虚拟时态
1）if 引导的从句
1)certainty : if present, then present
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