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、while
B、which
C、that
D、since

答案C

解析注意词组not…until用于强调句时，往往要写成not until…that。

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大学英语三级A级

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