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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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这里只能用will不能用would，因为前面if没有用虚拟；如果没有这个if从句，用would表示排放最好不要上升之意，比用will好
if did/were to, then would/should/might/could; if had, then would have; if should, then would
by 2010 emissions will soar to a level more than one-third higher than that in 1990/ than in 1990, 不能说than those in 1990/than those will in 1990，这是把level和emissions相比，错误
正如I get an apple bigger than you是把apple和you比，表示拿到一个比你人还大的苹果；应该是I get an apple bigger than you do或than yours。
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