In the 1950s in the USA, most families had just one phone at home, and wireless phones _______ yet._刷题宝

题干

In the 1950s in the USA, most families had just one phone at home, and wireless phones _______ yet.

A：haven't invented

B：haven't been invented

C：hadn't invented

D：hadn't been invented

上一题下一题 0.0难度选择题更新时间:2018-11-16 02:41:17

答案(点此获取答案解析）

D

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