In 2015, a team led by materials scientists Anirudha Sumant and Diana Berman succeeded in reducing the coefficient of friction (COF) between two surfaces to the lowest possible level—superlubricity. A nearly frictionless (and, as its name suggests, extremely slippery) state, ______blank
Which choice completes the text so that it conforms to the conventions of Standard English?
Correct answer: D
Explanation
Choice D is the best answer. The subject of the modifier “a nearly frictionless state” is “superlubricity.” Subject-modifier placement requires a modifier and its subject to be next to one another, so “superlubricity” must be the first word in the missing clause.
Choice A is incorrect. This choice creates a subject-modifier placement error. The subject of the modifier “a nearly frictionless state” is “superlubricity.” Subject-modifier placement requires a modifier and its subject to be next to one another, so “superlubricity” must be the first word in the missing clause. Choice B is incorrect. This choice creates a subject-modifier placement error. The subject of the modifier “a nearly frictionless state” is “superlubricity.” Subject-modifier placement requires a modifier and its subject to be next to one another, so “superlubricity” must be the first word in the missing clause. Choice C is incorrect. This choice creates a subject-modifier placement error. The subject of the modifier “a nearly frictionless state” is “superlubricity.” Subject-modifier placement requires a modifier and its subject to be next to one another, so “superlubricity” must be the first word in the missing clause.
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