If current trends continue, by the end of 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 答案是B,给出E不对的理由是主语应该使用will, 而不是would. 我想请问If 作为条件的虚拟语气，后面不应该是用过去将来式的吗？还有，说E中的they无指代。不可以就近指代carbon emissions吗？ | 
