关于从句的问题

liziyao

251. 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 1970's. .

extinction; its numbers are now five times greater than
extinction; its numbers are now five times more than
extinction, their numbers now fivefold what they were
extinction, now with fivefold the numbers they had
extinction, now with numbers five times greater than
答案肯定是A，但是E中，WITH 引导的介词短语作状语，同时省略THOSE 为何不对？？
另外，我一直以为介词短语作状语，加豆号放句末时，后面不能再跟任何从句，见OG中205题：WITH CREST AND THROUGHS ALTHOUGH THEY ARE FORMED BY **，这样定错，因为ALTHOUGH 前无主句，但是好象不是这么回事，请看下例题：
90. Since 1986, when the Department of Labor began to allow investment officers' fees to be based on how the funds they manage perform, several corporations began paying their investment advisers a small basic fee, with a contract promising higher fees if the managers perform well.

WITH 后为状语，但它后面跟了一个IF 从句，为什么？？？
[em24][em24]

tongxun

liziyao兄：
  省略numbers前的所属名词，易引起歧义。谁的？对吧。但ETS这老贼的语法选项如我前面帖子所讲，只让咱们选最佳的，而最佳选项并不代表完全没有错误，但请紧记：若有明确指代或所属的，不容易引起歧义的选项，才是最佳选项。有，就是它！
  下贴跟着讲

tongxun

liziyao：关于从句的问题，我的看法：你的理解基本对。就象
如果OG 90题由：with a contract promising higher fees if the managers perform well.改为with a contract promising higher fees if it is/its。。。。则本句必错

liziyao

重大更正，本人在注册时，随便点了头象，是LIZIYAO JJ RATHER THAN GG