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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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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