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3.The professor and his students are working at weekends _______ the project in time.(  )
A.competingB.completesC.have completedD.to complete

分析 为了及时完成这个项目,在周末教授和他的学生正在工作.

解答 答案:D.考查不定式.句意:为了及时完成这个项目,在周末教授和他的学生正在工作.根据题干The professor and his students are working at weekends _______ the project in time.可知这里to complete表目的,做目的状语,即为了及时完成这个项目,在周末教授和他的学生正在工作.故选D.

点评 仔细分析句子的结构,根据具体内容作答.

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