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 “与…对等”可用两种方式表达:be equal to或者equal。equal作动词时,后直接接名词作宾语。
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