题目内容

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 二十世纪五十年代在美国，绝大多数家庭只有一部电话，无线电话还没有发明出来．

解答 答案：D
句中invent与主语phones构成动宾关系，要用被动语态；invent的动作发生在谓语动词had之前，是过去的过去，要用过去完成时态的被动语态．故选D．

点评 表示过去某一时间或动作以前已经发生或完成了的动作对过去的某一点造成的某种影响或是结果，用来指在另一个过去行动之前就已经完成了的事件．它表示动作发生的时间是"过去的过去"，侧重事情的结果．

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请阅读启事并写一封应征邮件．内容要点如下：
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C．The potential market for flying cars．
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A．It causes traffic jams．
B．It is difficult to operate．
C．It is very expensive．
D．It burns too much fuel．
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A．Cautious．
B．Favorable．
C．Ambiguous．
D．Disapproving．
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A．In a library．
B．At a bookstore．
C．In a museum．
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A．having developedB．being developed
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A．walk through huge special cages to watch all sots of animals
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