【題目】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世紀50年代的美國,大多數(shù)家庭只有一部電話,無線電話直到那時還沒有被發(fā)明出來。本題考查動詞的時態(tài)、語態(tài)。首先無線電話與發(fā)明是被動關(guān)系,所以排除AC,另外通過時間“直到那時”,相當于by+過去的時間,應當選擇過去完成時,答案選D。

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