单项选择题


A．obstructed
B．intruded
C．obtained
D．hindered
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单项选择题
A．aboutB．atC．inD．with
A．about
B．at
C．in
D．with
单项选择题
A．is performedB．performedC．be performedD．perform
A．is performed
B．performed
C．be performed
D．perform
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