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 CableTVbeganin1948intheUSA,butittook50years

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 CableTVbeganin1948intheUSA,butittook50years

 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

【回答】

A

知识点:连词

题型:选择题

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