单项选择题

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

A．mistake
B．error
C．success
D．experiment
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单项选择题
We should be able to do the job for you quickly, ______ you give us all the necessary information.
A．in case
B．as if
C．or else
D．provided that
单项选择题
Linda did not have time to go to the concert last night because she was busy ______ for her experiment.
A．to prepare
B．to be prepared
C．being prepared
D．preparing
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