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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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
单项选择题
Some of the paintings formerly ______the Italian Renaissance artist are now thought to have been created by one of his students.
A．submitted to
B．adapted from
C．denied by
D．attributed to
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