It was not until 1920 regular radio broadcast began.

A.
while
B.
which
C.
that
D.
since

C
解析：
眾所周知，當時間狀語由until/till引出時，如果謂語動詞為非延續性動詞，則要用否定式，表示“直到……才……”。本句的正常結構應為：Regular radio broadcast didn’t begin until 1920.如果強調本句的時間狀語，則要把not和until...一起放在句首，可以構成：Not until 1920 did regular radio broadcast begin.（注意表示否定意義的副詞位于句首，要倒裝），如果使用強調結構，則可構成：It was not until 1920 that regular radio broadcast began.

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It was not until 1920 regular radio broadcast began.