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Standard English Conventions Difficulty: Hard

Mathematician Grigori Perelman, sometimes in conjunction with mathematicians Richard S. Hamilton and Shing-Tung Yau, blank credited with proving the Poincaré conjecture. Having built on Hamilton’s previous work to solve the proof, Perelman has insisted that Hamilton receive credit. Yau later found and closed gaps in Perelman’s proof, persuading some mathematicians that he deserves credit as well.

Which choice completes the text so that it conforms to the conventions of Standard English?

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Explanation

Choice D is the best answer. The convention being tested is subject-verb agreement. The singular verb "is credited" agrees in number with the singular subject "mathematician Grigori Perelman."

Choice A is incorrect because the plural verb "are credited" doesn’t agree in number with the singular subject "mathematician Grigori Perelman." Choice B is incorrect because the plural verb "have been credited" doesn’t agree in number with the singular subject "mathematician Grigori Perelman." Choice C is incorrect because the plural verb "are being credited" doesn’t agree in number with the singular subject "mathematician Grigori Perelman."