【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】二十世紀(jì)五十年代在美國(guó)，絕大多數(shù)家庭只有一部電話，無(wú)繩電話還沒(méi)有發(fā)明出來(lái)．句中invent與主語(yǔ)phones構(gòu)成動(dòng)賓關(guān)系，要用被動(dòng)語(yǔ)態(tài)；invent的動(dòng)作發(fā)生在謂語(yǔ)動(dòng)詞had之前，是過(guò)去的過(guò)去，要用過(guò)去完成時(shí)態(tài)的被動(dòng)語(yǔ)態(tài)．故選D．

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