单项选择题

Many citizens appealed to the city government for enacting ______ laws to protect the consumers.

A. rigorous
B. equivocal
C. stringent
D. furtive
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单项选择题
A considerable amount of time and money has been invested in ______ this system.
A. defining
B. implying
C. reducing
D. perfecting
单项选择题
The teachers tried to （） these students that they could solve the complicated problem, however, they just didn't see the point．

A．convince
B．encourage
C．consult
D．concern
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