单项选择题

It is commonly acknowledged that no one can make a ______ purse out of a sow’s ear.

A. cotton
B. nylon
C. silk
D. satin
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单项选择题
Because of the economic crises, many graduating students have to be ______ the pavemenmts for a job even before graduation.
A. walking
B. pounding
C. locating
D. cashing
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