单项选择题

Salaries for ______ positions seem to be higher than for permanent ones.

A．legal
B．optional
C．voluntary
D．temporary
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单项选择题
Can you give me even the ______ clue as to where her son might be
A．simplest
B．slightest
C．least
D．utmost
单项选择题
Tomorrow the mayor is to ______ a group of Canadian businessmen on a tour of the city.
A．coordinate
B．cooperate
C．accompany
D．associate
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