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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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find solid proof for the bird's continued existence，为existence找证据
find solid proof that the bird still exists，找到鸟仍然存在的证据
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