题目内容
19.Mary _________ as a volunteer teacher for 10years.( )| A. | works | B. | will work | C. | worked | D. | has worked |
分析 玛丽做一名志愿者老师十年了.
解答 答案:D.结合句意work动作发生在过去,持续了一段时间,故用现在完成时have、has+过去分词,主语Mary三单,故has,故答案是D.
点评 现在完成时有两种用法1.过去发生的某一动作对现在造成的影响或结果或到现在为止已经发生或完成的动作.2.表示过去发生的、持续到现在的动作或状态.
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