单项选择题

We can hardly avoid making any mistakes in our work ______ hard we try.

A．whatever
B．how
C．no matter
D．however
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单项选择题
Before signing the contract, Mr. White looked it over ______.
A．primarily
B．evenly
C．formally
D．cautiously
单项选择题
They will go home for winter vacation as soon as they ______ their exams.
A．have
B．finish
C．will finish
D．will have finished
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