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    18、The millions of calculations involved, had they been done by hand, _____ all practical value bythe time they were finished．

    A．could lose                                    B．would have lost

    C．might lose                                    D．ought to have lost

    18、B

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    The millions of calculations involved, had they been done by hand, _____ all practical value bythe time they were finished．

    A．could lose                                    B．would have lost

    C．might lose                                    D．ought to have lost

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