题目内容
【题目】Cable TV began in 1948 in the USA, but it took 50 years ________ 66 percent of American households had it.
A. before B. when
C. after D. until
【答案】A
【解析】
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题目内容
【题目】Cable TV began in 1948 in the USA, but it took 50 years ________ 66 percent of American households had it.
A. before B. when
C. after D. until
【答案】A
【解析】