It is known to us it was not until 1938 the first colour TV programme began to be broadcast in the world.
A. that, which
B. /, /
C. that, that
D. which, that
网友回答
A. that, which
B. /, /
(答案→)C. that, that
D. which, that
解析：第一空是that引导的主语从句，第二空是强调句型it is...that...；句意是直到1983年世界上第一个彩色电视节目播出，是众所周知的。