If a computer crashes,you will lose the file you _____ on unless you save it regularly.?   
A．a(chǎn)re workingB．work?
C．will workD．worked?
 A
  考查時態(tài)。依據(jù)常識可以知道，電腦癱瘓，之前的文件不會丟失，而即將進行的文件也不可能丟失，所以可以排除C、D兩項；再依據(jù)后文的save it regularly可知，這些文件應該是正在進行的文件，所以用進行時態(tài)。
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