单项选择题

The best solution to the problem can only be found by a process of trial and ______.

A．error
B．mistake
C．success
D．experiment
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单项选择题
The items contained in the parcel don't correspond ______ those on the list that accompanied it.
A．against
B．for
C．from
D．with
单项选择题
What ______ did they employ when they selected this picture as the prizewinner
A．criterion
B．regulation
C．way
D．test
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