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题库 / Prep2007E2-SC-110
The ivory-billed woodpecker, once the largest woodpecker in North America at a striking 20 inches tall, has moved in and out of the extinct category, with scientists consistently unable to find solid proof for the bird to still exist.
for the bird to still exist
for the bird as still existing
for the bird's continued existence
that the bird still exists
of the bird and its continued existence
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此题求讲解。D选项正确，是同位语。C选项为什么不能看做是proof的定语？
同问。C选项作为定语，难道是应该把the bird's continued existence改成the bird's continuing existence?
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