A diamond is _________ that requires immense pressure to form.
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writingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
a precious gemstone
B
valuable gemstones
C
rare jewels
D
expensive stones
Correct Answer: A
Choice A is the best answer. The subject "A diamond" is singular, so the predicate noun must be singular ("a precious gemstone").
Choice B is incorrect because "gemstones" is plural. Choice C is incorrect because "jewels" is plural. Choice D is incorrect because "stones" is plural.