Inthe1950sintheUSA,mostfamilie

更新 2022-09-04
科目英语
题型选择题
难度中等
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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

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