题目 / 答案提交正确答案
it was not until 1920()regular radio broadcast began.
A:while
B:which
C:that
D:since
正确答案：C:that
答案解析：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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