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.
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Asevere enough for the United States Fish and Wildlife Service quite possibly to list it
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Bsevere enough so that the United States Fish and Wildlife Service could well list them
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Csevere enough for it quite possibly to be listed by the United States Fish and Wildlife Service
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Dso severe that the United States Fish and Wildlife Service could well list it
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Eso severe that they could well be listed by the United States Fish and Wildlife Service
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正确答案: D