2. 外语
  3. It was not until 1920 ______ regular radio broadcast began.

It was not until 1920 ______ regular radio broadcast began.

admin2009-08-15  17
问题 It was not until 1920 ______ regular radio broadcast began.
选项 A、that
B、while
C、which
D、since
答案A
解析 强调句型:it is．．．that．．．
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