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例：The decline of the mountain yellow-legged frog in the high reaches of the Sierra Nevada has become severe enough for the United States Fish and Wildlife Service quite possibly to list it as an endangered species in the near future.
(A) severe enough for the United States Fish and Wildlife Service quite possibly to list it
(B) severe enough so that the United States Fish and Wildlife Service could well list them
(C) severe enough for it quite possibly to be listed by the United States Fish and Wildlife Service
(D) so severe that the United States Fish and Wildlife Service could well list it
(E) so severe that they could well be listed by the United States Fish and Wildlife Service
　原文意思：
　一种青蛙的下降变得如此严重从而是美国政府把这种动物列入濒危物种
　题目分析：
　有的选项用 severe enough for 有的用 so severe 并且用 that 把导致的结果前后分开，显然加上 that 使得意思前后更清楚，前面是某些原因很严重而 that 后面就是导致的结果，A干掉。 B 用 them， 可这个 them 指的是 frog， 是个单数名词， 不能用 them， 干掉。 C 没用 that，干掉。D 既用了 that 使前后分开而且后面用 it，逻辑通顺，留着。E 用 they 指 frog，和 B的错误类似，干掉！
 

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