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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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
Your advice would be ______ valuable to him, since he is now at his wit's end.
A．excessively
B．exceedingly
C．extensively
D．exclusively
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