单项选择题

The millions of calculations involved, 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
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The world's greatest sporting event, the Olympic games, upholds the amateur ideal that ______ matters is not winning but participating.
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Some people viewed the findings with caution, noting that a cause-effect relationship between smoking and cancer remains ______.
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