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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单项选择题
—Would you ____________ me ____________ to carry the box upstairs—With pleasure.
A．give... favor
B．do... the favor
C．do... favor
D．give... the favor
单项选择题
____________ off the radio—the baby's asleep.
A．Turn
B．Turning
C．Turned
D．To turn
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