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、what
答案C
解析 本题考查句型。本句为强调句型，用that引导，故选C。
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