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 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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