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Prices reach equilibrium at the level at which quantity demanded ______ quantity supplied.

    A.is equal to       B.equal            C. equals to        D. is equal

A


解析:

语法结构题。本句的难点是:be equal to意为“与…相等”,等于及物动词equal。任at which引导的定语从句中,主语为第三人称单数,而[B]项equal又没有词尾s,C.和D.两项的形式又不正确,所以[A]项正确,因其既合语法也合句意。本句的意思是:物价应在供求量相等的水平上达到平衡。

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