单项选择题

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

A．is equal to
B．equal
C．equals to
D．is equal
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单项选择题
We booked rooms at the hotel ______ we should find no vacancies on our arrival.
A．whenever
B．if
C．since
D．lest
单项选择题
I've already told you that I'm going to buy it, ______.
A．no matter how it costs
B．however does it costs much
C．how much does it cost
D．however much it costs
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