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 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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