The calculations, had they been done by hand, ______all practical value by the time they were finished.
A．had lostB．would loseC．should have lostD．would have lost
D

試題分析:句意：這些計算如果用手工進(jìn)行的話，那么當(dāng)他們完成后將失去所有的實際價值。句中had they been done是if they had been done的省略，是對過去的虛擬，所以主句謂語應(yīng)該用would have done，選D。
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