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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
考查時態(tài)：句意是:如果電腦死機，如果你不早點保存，就會丟掉正在處理的文件，說明是在死機的時候正在做的事，選A。
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