【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】二十世紀五十年代在美國，絕大多數(shù)家庭只有一部電話，無繩電話還沒有發(fā)明出來．句中invent與主語phones構(gòu)成動賓關(guān)系，要用被動語態(tài)；invent的動作發(fā)生在謂語動詞had之前，是過去的過去，要用過去完成時態(tài)的被動語態(tài)．故選D．

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