题目内容
18．I met a good friend of mine while I ______on the street．（ ）| A． | walks | B． | walk | C． | was walking | D． | am walking |
分析 当我正在街上走的时候，我遇到了我的一个好朋友．
解答 答案：C 联系语境，结合前后句的关系I met a good friend of mine 和while I ______on the street并结合选项的动词walk，可知met和walk这两个动作是在过去同时发生的，再根据关键词while，应该理解为当我正在街上走的时候遇到了我的好朋友，强调是在过去的某个时间点正在进行的动作或状态，所以应用过去进行时．过去进行时的构成为was/were+现在分词．主语为I，所以应用was，表达为was walking．故选C．
点评 此题考查过去进行时的用法．联系语境并抓住关键词准确理解句意的基础上把握好时态是解决本题的关键所在．
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