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．having been done
C．they had been done
D．they were done
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单项选择题
They assured us that ______ was waiting for us they were there to share it.
A．what
B．whatever
C．it
D．whoever
单项选择题
A large fish was slowly swimming through the water, its tai ______ back and forth like the pendulum of a clock.
A．swung
B．was swinging
C．was swung
D．swinging
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