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. had lost
B. would have lost
C. would lose
D. should have lost

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单项选择题
She asked the worker how long （） to build the house.

A. it had taken
B. had it taken
C. would it take
D. it was taken
单项选择题
Things might have been much worse if the mother （） on her right to keep the baby.

A. has been insisting
B. had insisted
C. would insist
D. insisted
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