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Passage context: 'Nutritionists consider Greek yogurt to be a healthy food: it is an excellent source of calcium and protein, serves TO BE a digestive aid, and contains few calories in its unsweetened low- and non-fat forms.' Which choice best replaces the underlined portion?

Afor
BNO CHANGE (to be)
Cas
Dlike
Answer & Solution
Correct answer: C. as
Choice B (as) is correct. 'Serves as' is the standard idiomatic phrasing meaning 'functions as'. 'Serves to be' is awkward; 'serves like' and 'serves for' are unidiomatic in this context.
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