单项选择题

The president promised to keep all the board members______ of how the negotiations were going on.

A．inform
B．informing
C．be informed
D．informed
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单项选择题
It is important that the hotel receptionist ______ that guests are registered correctly.
A．make sure
B．has made sure
C．made sure
D．must make sure
单项选择题
______ receiving financial support from family, community or the government is allowed, it is never admired.
A．Once
B．Lest
C．As
D．Although
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