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17.If there"s a lot of work          ,I'd like to keep on until it is finished.(  )
A.doB.to doC.doneD.doing

分析 如果还有工作要做,我愿意坚持直到结束.

解答 分析句子结构可以知道,本题考查的是非谓语动词的用法,在这里to do不定式作后置定语,故选B.

点评 动词的基本用法是作谓语.当句中已经有了谓语动词了,要选或要填的动词就只能用非谓语形式了.非谓语形式有三种:1、动词不定式:to do  2、动词的ing:doing  3、动词的过去分词:done,在解决此类题目时,一定要找出动词的位置,再就是熟记一些固定搭配.

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