Cable TV began in 1948 in the USA, but it took 50 years ________ 66 percent of American households h...
2022-07-05 13:37:02 175次 江苏省徐州市2019-2020学年高二下学期第一次月考英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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
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