单项选择题

The millions of calculations involved, ______ by hand, would have lost all practical value by the time they were finished.

A．had they been done
B．they had been done
C．having been done
D．they were done
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单项选择题
A．doomedB．boundC．designatedD．supposed
A．doomed
B．bound
C．designated
D．supposed
单项选择题
A．passionatelyB．efficientlyC．fluentlyD．harmoniously
A．passionately
B．efficiently
C．fluently
D．harmoniously
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