It was not until 1920 ______ regular radio broadcast began.A、thatB、whileC、whic

游客2025-07-31 9

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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