单项选择题

It is vital that enough money ______ to fund the project.

A．be collected
B．must be collected
C．is collected
D．can be collected
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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
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
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