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

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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 be equal to是固定搭配，意为“与…相等”，等于及物动词equal。在at which引导的定语从句中，主语为第三人称单数，而B equal不是第三人称单数形式，C 和D 形式又不正确，故A 为答案。

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