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
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单项选择题
The article suggests that when a person______ under unusual stress he should be especially careful to have a well-balanced diet.
A．is
B．were
C．be
D．was
单项选择题
These are signs ______ restaurants are becoming more popular with families.
A．that
B．which
C．in which
D．whose
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