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

It was not until 1920 ________ regular radio broadcasts began.

admin2010-02-05  49
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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