单项选择题

A．constitution
B．distribution
C．instruction
D．contribution
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单项选择题
A．to studyB．studyingC．studiedD．being studied
A．to study
B．studying
C．studied
D．being studied
单项选择题
A．normalB．ordinaryC．properD．appropriate
A．normal
B．ordinary
C．proper
D．appropriate
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