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【单选题】

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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参考答案:
参考解析:
.
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举一反三

【单选题】All those old buildings ______ down tomorrow. [ ]

A.
will be knocked
B.
will knock
C.
will have knocked
D.
knock