单项选择题

A ______to this problem is expected to be found before long.

A．result
B．response
C．settlement
D．solution
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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
单项选择题
The relationship between employers and employees has been studied ______.
A．originally
B．extremely
C．violently
D．intensively
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