单项选择题

______their assistance, we would not have finished the task ahead of schedule.

A. Hadn'tbeen for B. Had it not been for C. It hadn't been for
D. Had not it been for
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单项选择题
The examination has been cancelled. You ______ all that revision, after all.
A. didn't need to have done
B. needn't have done
C. need to do
D. needn't do
单项选择题
At first the company refused to purchase the equipment, but this decision was ______ revised.
A. subsequently
B. successively
C. predominantly
D. preliminarily
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