Dentists often debate whether brushing with an electric toothbrush or ______________________ is more effective for plaque removal.
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writingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
using a manual one
B
a manual toothbrush
C
the use of a manual one
D
to use a manual one
Correct Answer: A
Choice A is the best answer. The sentence compares "brushing" (gerund) to "using" (gerund). This maintains parallel structure.
Choice B is incorrect because it compares an action ("brushing") to an object ("toothbrush"). Choice C is incorrect because "the use" is a noun, which breaks the parallel with the gerund "brushing." Choice D is incorrect because it compares a gerund to an infinitive ("to use").