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请教一道语法

The gyrfalcon, an Arctic bird of prey, has survived a close brush with *****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
(E) extinction, now with numbers five times greater than  
B 为什么不对?
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答案是  A

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