单项选择题

The laughter at his joke is never forced, but always ______.

A．homogeneous
B．simultaneous
C．spontaneous
D．instinctive
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单项选择题
He never attempted to ______ any excuse for being late.
A．fluctuate
B．fabricate
C．lubricate
D．manipulate
单项选择题
According to one employee, who wishes to remain ______, the company engaged in illegal activ ities.
A．autonomous
B．automatic
C．anonymous
D．monotonous
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