单项选择题

Both certificates are ______ for three months and the ceremony must take place in the district where notice has been given.

A．valuable
B．effective
C．valid
D．functional
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单项选择题
The publishing company offers their staff opportunities for ______ in decision-making.
A．apprehension
B．appreciation
C．presentation
D．participation
单项选择题
Although his lawyers were ______, they couldn't be sure about the final outcome of the trial.
A．indefinite
B．optimistic
C．pessimistic
D．critical
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