单项选择题

It was not until 1920______regular radio broadcasts began.

A．which
B．when
C．that
D．what
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Accidents are quite______on this part of the highway.
A．ordinary
B．regular
C．common
D．popular
单项选择题
There is so much time left, so I can tell you about it______.
A．in short
B．in all
C．in detail
D．in whole
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