If current trends continue, by the year 2010 carbon emissions in theUnited States will soar to a level more than one-third higher than werethose 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 morethan 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 这个题为什么是选B呢? |