OG verbal 第二版 70题 旧题新问，关于fivefold的用法

sallyluwawa

The gyrfalcon, an Arctic bird of prey, has survived a close brush with extinction; its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970s.
A extinction; its numbers are now five times greater than
B extinction; its numbers are now five times more than
C extinction, their numbers now fivefold what they were
D extinction, now with fivefold the numbers they had
E extinction, now with numbers five times greater than

各位NN，这道题已经有讨论帖详细的说明了关于AB选项中 greater/more的问题， DE选项中，with短语错误的修饰了extinction的问题，than比较的对象是now和when的问题。
但是有关于fivefold的用法有什么问题吗。
OG答案里C/D 的解释都有：Fivefold the numbers they had is awkward and nonstandard and implies that there are now more numbers , rather than more gyrfalcons. 我不能理解，NN们能就fivefold的用法讲一下吗？？

sallyluwawa

自己顶起

sallyluwawa

有没有大神能给解答一下呀，好孤寂！

boalgmat

fivefold 在GMAT中 多用为形容词  1）a threefold
increase in revenue，  还有numbers 比较 用greater 不用 more 这都算是 idiom  MM中有

sallyluwawa

boalgmat 发表于 2014-4-5 23:01
fivefold 在GMAT中 多用为形容词  1）a threefold
increase in revenue，  还有numbers 比较 用greater 不 ...

多谢！！！！！！！！！！！！！！！！！！ MM是指什么？

zwhjzwhj

亲爱的楼主啊，你所说的“这道题已经有讨论帖详细的说明了关于AB选项中 greater/more的问题， DE选项中，with短语错误的修饰了extinction的问题，than比较的对象是now和when的问题。” 这些帖子都在哪呢，你用什么关键词搜出来的？？我直接搜“OG 70” 都木有搜出很“详细”的贴子哦。。。