【题目】It was not until 1920 ______ regular radio broadcasts began.
A. whileB. whichC. thatD. since
在线课程【答案】C
【解析】
考查强调句。句意：直到1920年才开始有了定期的无线电广播。这是一个强调句，对状语进行强调。强调句型的构成是：it is/was+被强调部分+that/who+其他。空格处填that，故选C。
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