13．In the 1950s in the USA，most families had just one phone at home，and wireless phones _______ yet．（　�。�
A．haven't inventedB．haven't been invented
C．hadn't inventedD．hadn't been invented

分析 二十世紀五十年代在美國，絕大多數(shù)家庭只有一部電話，無線電話還沒有發(fā)明出來．

解答 答案：D
句中invent與主語phones構成動賓關系，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．

點評 表示過去某一時間或動作以前已經(jīng)發(fā)生或完成了的動作對過去的某一點造成的某種影響或是結果，用來指在另一個過去行動之前就已經(jīng)完成了的事件．它表示動作發(fā)生的時間是"過去的過去"，側重事情的結果．

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