单项选择题

It is essential that these application forms ______ back as early as possible.

A．must be sent
B．will be sent
C．are sent
D．be sent
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单项选择题
______ in an atmosphere of simple living was what her parents wished for.
A．The girl was educated
B．The girl educated
C．The girl's being educated
D．The girl to be educated
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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