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 relationship between employers and employees has been studied ______.
A．originally
B．extremely
C．violently
D．intensively
单项选择题
Susan will come to watch him ______at Wimbledon this week.
A．played
B．play
C．to play
D．playing
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