单项选择题

We must begin testing this instrument, no matter ______ difficult it is.

A．however
B．how
C．whatever
D．what
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单项选择题
Every means ______ but without much result.
A．have been tried
B．has been tried
C．have tried
D．has tried
单项选择题
Finding it difficult to ______ to the climate in the city, he decided to move to the north.
A．fit
B．adopt
C．suit
D．adapt
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