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18.We      on this project for four hours.Let's have a rest.(  )
A.are workingB.have been working
C.workedD.had worked

分析 句意:我们一直在做这个项目已4个小时.让我们休息一下吧.

解答 答案B.句中时间状语"for four hours"通常与现在完成时连用,排除A、C和D选项.分析语境"Let's have a rest"可知,我们一直在做工作,说明"work on the project"动作在过去就已经开始,一直持续到现在,因此用现在完成进行时,故选B.

点评 本题考查时态的用法.解答此类题目的关键是要读懂句意,分析上下文的语境,判断时态,锁定答案.

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