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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 workingB.workC.will workD.worked
A
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。
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