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

It was not until 1920 ____________ regular radio broadcasts began.

admin2009-05-15  49
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。故本题答案为C。
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