Color TV was first shown in 1929. It took more than two decades, . until 1951, forcolor broadcasts to begin in the USA.A. though B. therefore C. otherwise D. anyway 题目和参考答案——青夏教育精英家教网——

题目内容

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

A

略

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