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【题目】--I’m exhausted. I ______ on a design day and night.

--You’d better have several days off after finishing it. Otherwise you might break down.

A. work B. worked

C. had worked D. have been working

【答案】D

【解析】

试题分析:考查动词时态。句意:--我很累,我整天都在忙着这个计划。-结束后你最好休息几天,否则你会垮掉的。说明做这个项目是从过去到现在说话的时候一直进行的,有可能还要继续,用现在完成进行时,A是一般过去式,表示纯粹的过去的动作,B是现在完成时,表示过去的动作对现在的影响,C是一般现在时,表示一贯的行为,所以选D。

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