单项选择题

He had a clear ______of what was wrong with the machine and fixed it in a short time.

A．defect
B．dissertation
C．perception
D．persuasion
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单项选择题
Your advice would be ______valuable to him, who is at present at his wit's end.
A．excessively
B．exclusively
C．extensively
D．exceedingly
单项选择题
Business in this area has been ______because prices are too high.
A．slack
B．prosperous
C．optimal
D．serious
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