单项选择题

It's nearly seven o'clock. Jack ______ be here at any moment.

A．must
B．need
C．should
D．can
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单项选择题
In some parts of the world, tea ______ with milk and sugar.
A．is serving
B．is served
C．serves
D．served
单项选择题
It was not until 1920 ______ regular radio broadcasts began.
A．when
B．which
C．that
D．since
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