题目内容
4．What changes________here since I last came？（ ）| A． | have taken place | B． | will change | ||
| C． | had done |
分析 自从我上次来这里，这里发生了什么样的变化？
解答 答案：A．
根据since I last came可知，"自从我上次来"一直延续到现在它表示一段时间，可知用现在完成时；并且要用延续性动词，take place发生；现在完成时态的结构为have/has+动词的过去分词，主语是changes，所以助动词用have，故选A．
点评 本题主要考查现在完成时，用法：表示过去发生或完成的动作对现在造成的影响或结果，还表示过去发生动作一直持续到现在．其结构是have/has+及物动词的过去分词．
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