题目内容
16．So far，three quarters of the work_____ by others，it's your turn to do the rest of it．（ ）| A． | were finished | B． | has finished | ||
| C． | has been finished | D． | have been finished |
分析 至今，别人已经完成了四分之三的工作了，剩下的轮到你了．
解答 答案：C．结合so far可知动作发生在过去，对现在造成一定的影响，故用现在完成时have/has+过去分词，three quarters of the work作为主语，work是不可数名词，故has，是动词的承受者，故用现在完成时的被动语态have/has+been+过去分词，故答案是C．
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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