it was not until 1920()regular radio broadcast began.
A:while
B:which
C:that
D:since
it was not until 1920()regular radio broadcast began.
A:while
B:which
C:that
D:since
答案:C:that
解析:It was not until 1920 that regular radio broadcast began.
直到1920年,才有收音机.
that引导not until的从句,为:It is not until...that...句型,意思是:直到...才...
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