It was not until 1920 regular radio broadcasts began． [ ] A． which B． when C． that D． since 题目和参考答案——青夏教育精英家教网—

题目内容

It was not until 1920 ________ regular radio broadcasts began．

[　　]

A．

which

B．

when

C．

that

D．

since

答案：C

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