单项选择题

______ down the radio--the baby's asleep in the next room.

A．Turn
B．Turning
C．Turned
D．To turn
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单项选择题
I hope there are enough glasses for each guest to have ______.
A．it
B．those
C．them
D．one
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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