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If a computer crashes, you will lose the file you _______ on if you don’t save it early enough.

A. are working                     B. work

C. will work                       D. worked

【解析】选A。考查时态。句意:如果电脑瘫痪,而你不及时保存的话,你就会丢失正在操作的文件。此处用现在进行时表示现在或当前一段时间正在进行的动作。

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