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Pricesreachequilibriumatthelevelatwhichquantitydemandedquantitysupplied.A.isequaltoB.equalC.equalstoD.isequal

题目详情
Prices reach equilibrium at the level at which quantity demanded ______ quantity supplied.
A.is equal to B.equal C.equals to D.is equal
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答案和解析
A 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...