题目内容

6.Half of the work ______ by now.(  )
A.has finishedB.has been finished
C.have been finished   

分析 到目前为止已经完成一半的工作了.

解答 答案:B 根据by now可知,这是现在完成时的标志,所以此处应使用现在完成时态.又知主语half of the work是动词finish的承受者,二者属于被动关系,所以此处应用现在完成时的被动语态,其结构为have/has been+过去分词;又知work是不可数名词是单数,所以此处应用has been finished.故选B

点评 此题考查现在完成时的被动语态.做题时,先找出句中标志词,判断句子应用的时态;再根据主语与动词的关系,判断语态,最终再根据主语的单复数,判断所用句型结构

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