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

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

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问题 Prices reach equilibrium at the level at which quantity demanded ______ quantity supplied.
选项 A、is equal to
B、equal
C、equals to
D、is equal
答案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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