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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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名词和从句的区别：
名词表示有时间终点，一般指事情已经结束。从句表示看不到终点。
这里鸟存在与否还待确认，而不是已经确认的事情，所以是没有时间终点的。
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