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18.-Mum,can I play baskball with Tom?
-When your homework    ,you can.(  )
A.finishB.finishesC.finishedD.is finished

分析 --妈妈,我可以和汤姆一起打篮球吗?
--当你的作业做完了,你就可以去.

解答 答案:D.
首先根据语境推测句意是"--妈妈,我可以和汤姆一起打篮球吗?--当你的作业做完了,你就可以去."设空处所在的句子是when引导的时间状语从句,用一般现在时代替一般将来时,主语 your homework 是动作finish  的承受者,所以用被动语态,一般现在时被动语态的构成是:主语+am/is/are+动词的过去分词,故选D.

点评 本题考查时态和语态.每个时态都有标志词,熟记这些标志词是做题的关键.在没有时间状语的情况下可以根据语境来对时态做出判断.判断语态的关键则是观察主语是谓语动词的执行者还是承受者.

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