Question

2193 ✗ These bones are proof that the animals really existed. These bones are [[ ]] proof that the animals really existed. a | _

Accepted Answer

proof These bones are a proof that the animals really existed. These bones are [[a]] proof that the animals really existed. _ Proof (= evidence) is usually an uncountable noun: 'Investigators now have proof of his involvement in the arms deal.'

Idx	2193
Keyword	proof
Type of Sentence	✗
Error Sentence	These bones are a proof that the animals really existed.
Correct Sentence	These bones are proof that the animals really existed.
Cloze Error Sentence	These bones are [[a]] proof that the animals really existed.
Cloze Sentence	These bones are [[ ]] proof that the animals really existed.
Cloze Answer	_
Choices	a \| _
Explanation	Proof (= evidence) is usually an uncountable noun: 'Investigators now have proof of his involvement in the arms deal.'

Proof Bones Animals Existed Evidence Uncountable Noun Investigators