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Boundaries (punctuation)

Standard English Conventions

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1Question 1 of 42Reading & Writing

A well-cast church bell rings with several pitches sounding at once rather than one pure tone, and a skilled bell founder tunes each of these overtones individually by shaving metal from precise points inside the still-rough _______ the hum an octave below the strike note, the "prime" at the strike note itself, and the tierce, quint, and nominal that together give the bell its particular color.

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