Radiocarbon dating of fossils taken from caves on islands along southeastern Alaska's coast suggest that at least a portion of the area was remaining ice-free during the last ice age.
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Asuggest that at least a portion of the area was remaining
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Bsuggest at least a portion of the area remaining
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Csuggests that at least a portion of the area remained
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Dsuggests at least a portion of the area that had remained
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Esuggests at least a portion of the area to have remained
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正确答案: C