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】選A。考查時(shí)態(tài)。句意：如果電腦癱瘓，而你不及時(shí)保存的話，你就會(huì)丟失正在操作的文件。此處用現(xiàn)在進(jìn)行時(shí)表示現(xiàn)在或當(dāng)前一段時(shí)間正在進(jìn)行的動(dòng)作。

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