It was not until 1920 regular radio broadcasts began. [ ] A．whileB．which C．thatD．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．while

B．which

C．that

D．since

答案：C
解析：

分析：根据题干结构可以判定是强调句型，因此答案为C．详细说明见讲解部分．

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