单项选择题


A．test
B．research
C．operation
D．project
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单项选择题
A．fixedB．designedC．knownD．produced
A．fixed
B．designed
C．known
D．produced
单项选择题
A．policemanB．suspectC．personD．criminal
A．policeman
B．suspect
C．person
D．criminal
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