SC一题求教

houhaibo528

If current trends continue, by the year 2010 carbon emissions in the United States will soar to a level more than one-third high than were those  in 1990, according to official projections.
A. will soar to a level more than one-third high than were those
B.  will soar to a level more than one-third high than that
C. would soar to a level more than one-third high than it was
D. would soar to a level more than one-third high than were those
E. would soar to a level more than one-third high than they were
答案是B,我选了D,
我有两个问题，想请教
1.will 为什么不用would，选用虚拟语气的方法？
2. carbon emissions 在后面为什么用that 代替，而不用those???

线香花火

IF present  ,  THEN future   代表对未来的确定性，而如果要用IF的虚拟语气的话前面的continue要用continued， 后面的再用would表示的是不太会发生的情况。。。这个可能我说的不好你去看看manhattan  的113页~~

houhaibo528

非常感谢，我马上去看，好像想起来，那个hypothetical subjunctive要用在不太可能发生的情况上 unlikely to happen
多谢！