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.
(A) will soar to a level more than one-third higher than were those
(B) will soar to a level more than one-third higher than that
(C) would soar to a level more than one-third higher than it was
(D) would soar to a level more than one-third higher than those
(E) would soar to a level more than one-third higher than they were
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. 主语应该使用will，而不是would
D. 主语应该使用will，而不是would；复数those没有指代对象
E. 主语应该使用will，而不是would；复数they没有指代对象
句子结构：If current trend continue, … carbon emissions … will soar..., according to…条件主从复合句。条件状语从句如果使用一般现在时，主语应该使用一般将来时
我的考虑是虚拟语气用would，然后they指代emissions，不知哪里错了？作者: zhisnoopy 时间: 2010-7-7 17:46
我觉得不是虚拟，是条件，只要current trends continue，那么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.
但是，我记得条件状语从句用一般现在时表示将来的，这里为什么是will呢？？作者: Luxe 时间: 2010-7-7 17:51
在gmat 里 if 从句的时态要落后主句一个时态，if A happen，B will happen. that 应该指代 level作者: agnesliu 时间: 2010-7-29 22:56
这题非虚拟 if……，will句式作者: lcr12318 时间: 2010-9-29 16:45 标题: Prep 2 58题新问题！NN来看看嘛，关于助动词，百思不得其解
58. (27510-!-item-!-188;#058&003569)
If current trends continue, by the year 2010 carbon emissions in the United States will soar to alevel more than one-third higher than were those in 1990, according to official projections.
(A) will soar to a level more than one-third higher than were those
(B) will soar to a level more than one-third higher than that
(C) would soar to a level more than one-third higher than it was
(D) would soar to a level more than one-third higher than those
(E) would soar to a level more than one-third higher than they were 为什么B中that后面不加助动词呢？ 根据Prep 1 128解释说：对主谓宾全的句型主语比较：A do sth than B do.（AB为对等名词，加do是为了显示这是一个可以发出动作的名词，因而确定是主语，进而确定是主语对比，而不是前一个的宾语和后面的主语的比较）。时态要据后定。
