Cable TV began in 1948 in the USA, but it took 50 years 66 percent of American households

发布时间：2020-08-16 08:14:38


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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(答案→)A. before
B. when
C. after
D. until
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