单项选择题

The storm sweeping over this area now is sure to cause ______ of vegetables in the coming days.

A．rarity
B．scarcity
C．invalidity
D．variety
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单项选择题
During the construction of skyscrapers, cranes are used to ______ building materials to the upper floors.
A．toss
B．tow
C．hoist
D．hurl
单项选择题
They assured us that ______ was waiting for us they were there to share it.
A．what
B．whatever
C．it
D．whoever
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