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(jì)五十年代在美國(guó)，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(gòu)成動(dòng)賓關(guān)系，要用被動(dòng)語態(tài)；invent的動(dòng)作發(fā)生在謂語動(dòng)詞had之前，是過去的過去，要用過去完成時(shí)態(tài)的被動(dòng)語態(tài)．故選D．

點(diǎn)評(píng) 表示過去某一時(shí)間或動(dòng)作以前已經(jīng)發(fā)生或完成了的動(dòng)作對(duì)過去的某一點(diǎn)造成的某種影響或是結(jié)果，用來指在另一個(gè)過去行動(dòng)之前就已經(jīng)完成了的事件．它表示動(dòng)作發(fā)生的時(shí)間是"過去的過去"，側(cè)重事情的結(jié)果．

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