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Carbohydrates are the most abundant and food sources of energy. [ ] A．least cost

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Carbohydrates are the most abundant and food sources of energy. [ ] A．least cost

Carbohydrates are the most abundant and _____ food sources of energy.

[]

A．least cost　B． least costly　C． less cost　D． fewer costs

试题答案

答案：B

提示：

这里需要构词法的支持：costly是由名词cost派生出来的形容词。

标签：andabundantsourcesfoodare

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