It was 1920 ______ regular radio broadcasts began. A．whileB．whenC．thatD．since_刷题宝

题干

It was 1920 ______ regular radio broadcasts began.

A．while

B．when

C．that

D．since

上一题下一题 0.85难度单项选择更新时间:2011-11-22 06:46:32

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