单项选择题

It is important that the hotel receptionist ______ that guests are registered correctly.

A．has made sure
B．made sure
C．must make sure
D．make sure
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单项选择题
The price of beer ______ from 40 cents to $ 4per liter during the summer season.
A．altered
B．ranged
C．separated
D．differed
单项选择题
Everything we eat and drink contains some salt: we can meet the body's need for it from natural sources without turning ______ the salt bottle.
A．up
B．to
C．on
D．over
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