单项选择题

It was essential that all the necessary documents ______ to the president's office before the end of this month.

A．be handed in
B．must be handed in
C．should hand in
D．had been handed in
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单项选择题
Two hours ______ the limit of this test.
A．are
B．has been
C．have been
D．is
单项选择题
It was in the bookstore ______ I met your brother the other day.
A．where
B．that
C．in which
D．in that
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