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
I didn't know the word. I had to ______ a dictionary.
A．look out
B．make out
C．refer to
D．go over
单项选择题
The price of beer ______ from 40 cents to $4 per liter during the summer season.
A．altered
B．ranged
C．separated
D．differed
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