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(shí)態(tài)。依據(jù)常識(shí)可以知道，電腦癱瘓，之前的文件不會(huì)丟失，而即將進(jìn)行的文件也不可能丟失，所以可以排除C、D兩項(xiàng)；再依據(jù)后文的save it regularly可知，這些文件應(yīng)該是正在進(jìn)行的文件，所以用進(jìn)行時(shí)態(tài)。
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