2. 外语
  3. It was not until 1920 _____ regular radio broadcasts began.

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、which
B、when
C、that
D、since
答案C
解析
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四川省大学英语三级

大学英语三级

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