Verbal Review（紫皮书） 72题关于对比

Taylor

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.
    

(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（A）

(E) extinction, now with numbers five times greater than

请问一下，than后面不需要that来代指numbers么，对比的应该是两个时期的numbers吧，that可以省略还是有别的解释？

谢谢

ktj

省略原则:比较从句的主语和谓语如果都与主句一致,是可以省略只保留介词短语或状语的.

Taylor

谢谢ktj

Zeldaw

以下是引用ktj在2007-5-27 10:27:00的发言：
省略原则:比较从句的主语和谓语如果都与主句一致,是可以省略只保留介词短语或状语的.

支持一下

springsound

以下是引用ktj在2007-5-27 10:27:00的发言：
省略原则:比较从句的主语和谓语如果都与主句一致,是可以省略只保留介词短语或状语的.

再请教一下, 这个"从句的主语和谓语如果都与主句一致", 要不要考虑时态的一致? 比如本题中, 主句的谓语are是一般现在时, 而从句中省略的应该是一般过去时的were. 也样也算是一致么?