Color TV was first shown in 1929. It took more than two decades, ， until 1951, forcolor br

发布时间：2020-08-16 08:24:05


Color TV was first shown in 1929. It took more than two decades,     ， until 1951, for
color broadcasts to begin in the USA.
A. though       B. therefore      C. otherwise      D. anyway

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