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题目
题型:不详难度:来源:
It was 1920 ______ regular radio broadcasts began.
A.whileB.whenC.thatD.since

答案
B
解析
考查定语从句。when 指先行词1920 。
核心考点
试题【 It was 1920 ______ regular radio broadcasts began. A.whileB.whenC.thatD.since】;主要考察你对连词等知识点的理解。[详细]
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