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
B选项的that不应该是复数吗?
D选项的would时态为什么不行呢?主将从现?
1. 指代level。
2. 是的。如果从句是过去时,主句会用would。
那老师,请问这个和虚拟语气有关系吗?还是纯粹的主将从现?
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