单项选择题

It was not until 1920（）regular radio broadcasts began.

A．while
B．which
C．that
D．since

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单项选择题
It's no good（）problems with a man like him.

A．to discuss
B．being discussed
C．discussing
D．to be discussed
单项选择题
The water will be further polluted unless some measures（）.

A．will be taken
B．are taken
C．were taken
D．had been taken
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