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

问题补充：

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

答案：

(答案→)A. are working

B. work

C. will work

D. worked

解析：考查时态：句意是:如果电脑死机，如果你不早点保存，就会丢掉正在处理的文件，说明是在死机的时候正在做的事，选A。