It was not until 1920 ________ regular radio broadcasts began.A、whileB、whichC、

游客2024-07-04 42

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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