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ThefirstcolorTVwasconstructedin1928,butitwasnotuntil193...

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ThefirstcolorTVwasconstructedin1928,butitwasnotuntil193...

The first color TV was constructed in 1928,but it was not until 1938___________the first program was broadcast.

   A. when             B. which            C. that            D. before

【回答】

C

知识点:强调句

题型:选择题

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