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【题目】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

【答案】D

【解析】句意:20世纪50年代的美国,大多数家庭只有一部电话,无线电话直到那时还没有被发明出来。本题考查动词的时态、语态。首先无线电话与发明是被动关系,所以排除AC,另外通过时间“直到那时”,相当于by+过去的时间,应当选择过去完成时,答案选D。

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