题目内容
7．Mary _____ a photo of Professor Smith while he was making a speech．（ ）| A． | takes | B． | took | C． | would take | D． | has taken |
分析 当史密斯教授在做演讲时，玛丽给他拍了张照片．
解答 答案：B
句中的while"在…时候"，"一边…一边…"；它强调主句的动作与从句的动作同时发生或主句的动作发生在从句的动作过程中；所以根据while 从句使用了过去进行时（ was making a speech）可知，主句的动作"_____ a photo of Professor Smith 给史密斯教授拍照"应该发生在"他（过去）在做演讲"的过程中或者也可以说两个动作在同时发生，所以此处要使用一般过去时；A．takes 是一般现在时态；B．took是take的一般过去是形式；C．would take是过去将来时；D．has taken 是现在完成时；故选B．
点评 本题考查了一般过去时在while从句中的用法，但是while从句中的谓语必须是表示动作或状态的延续性动词，它强调主句的动作与从句的动作同时发生或主句的动作发生在从句的动作过程中；因此当while从句使用过去进行时，主句应使用一般过去时；本句动词take的过去时形式是took，因此还需要熟练掌握动词不规则变化表．
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The man who had his bright lights on （48）Dand told Larry he had（49）Can emergency call．They（50）Aheard a woman's voice coming from the wrecked （毁坏的） vehicle．（51）Dthe vehicle，they saw that a woman was trying to get out of the broken window．They told her to stay（52）Buntil the emergency personnel arrived，（53）Dshe thought the car was going to（54）A．Larry told her that he had already put out the fire and she should not move（55）Cshe injured her neck．
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