It was not until 1920 ______ regular radio broadcasts began.

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问题 It was not until 1920 ______ regular radio broadcasts began.

选项 A、when
B、which
C、that
D、since

答案C

解析这是一个It is (was)．．that．．．的强调结构，强调时间状语。

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公共英语二级笔试

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