题目内容
17．Luckily，when the fire __________ on the top floor，all the employees had left for home．（ ）| A． | took place | B． | take place | ||
| C． | will take place | D． | would take place |
分析 幸运的是当顶楼起火时，所有的员工已经离开回家了．
解答 答案：A．A 是一般过去时，B一般现在时 C是一般将来时 D是过去将来时．根据"all the employees had left for home所有的员工已经离开回家了"用的是过去完成时，过去完成时表示在过去某一时间或动作之前已经发生或完成了的动作或状态，可知员工离开发生在起火之前，起火发生在过去，所以"when the fire __________ on the top floor"要用一般过去时，故选A．
点评 本题要求根据已知的时态选用正确的时态．掌握过去完成时的意义．
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