单项选择题

The librarian requires that all books（）returned before the last day of classes.

A．are
B．be
C．must be
D．would be

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单项选择题
（）might be expected, the response to the question was very mixed.

A．That
B．It
C．As
D．What
单项选择题
If law and order（）,neither the citizen nor his property is safe.

A．are not preserved
B．is not preserved
C．were not preserved
D．have not preserved
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