单选题 The millions of calculations, had they been done by hand,______all practical value by the time they were finisheD．
A．could lose B．would have lost
C．might lose D．ought to have lost

【正确答案】 B

【答案解析】[解析] 26．此句为假设条件被隐蔽的虚拟句，可还原为If they had been done by hand, the millions of calculations would have lost all practical value by the time they were finisheD．