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 like some bread—I don't feel like ____________ now.
A．eaten
B．eating
C．to eat
D．eat
单项选择题
— ____________ should I take the medicine— Three times a day.
A．How many pills
B．How much
C．How often
D．How many
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