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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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proof of sth比proof that好，that引导同位语解释说明proof的内容是鸟仍然存在
C，find proof for bird's existence，for作介词，接名词表示为某人做某事，do sth for sb/sth，解释不通；接doing表示用途或原因，The knife is used for cutting things. Thank you for coming to see me. 两个意思都不适用于proof和existence的关系。
proof of / proof that 都可以， 朗文 proof of purchase/ ownership/ identity ，我的理解1，动词优于名词 2，that 从句指明这是一件事，并非一个名词
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