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问题

Itwas 1920 ______ regular radio broadcasts began.

A:while
B:when
C:that
D:since
正确答案是:
同类题型

Tom speaks Chinesebetter than _______ else in his class.

_________________is Mike–He is __________ school.

You don’t look well! What’s the matter?—My son is _______ to computer games. And I have no idea what to do with it.

I ________ the pages together with a paperclip

In this university a medal with five thousand dollars _____ achieved success in science and technology every two years. [ ]

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