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
Football playing will continue to be ______ it is today--the most popular game for boys in schools.
A．as
B．how
C．which
D．what
单项选择题
If the task ______ by the end of this year is delayed, the company will be under punishment.
A．being completed
B．is completed
C．to be completed
D．completed
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