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 large fish was slowly swimming through the water, its tail ______ back and forth like the pendulum of a clock.
A. swung
B. was swinging
C. was swung
D. swinging
单项选择题
I'll be very glad that you agree to ______ this matter.
A. look up
B. look for
C. look over
D. look into
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