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【参考答案】

在serious前加a
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单项选择题
A.A college studentB.A university teacher.C.A middle school student.
A.A college student
B.A university teacher.
C.A middle school student.
单项选择题
A.How money came into beingB.What was used as money in the pastC.Chinese people were the earliest users of money.
A.How money came into being
B.What was used as money in the past
C.Chinese people were the earliest users of money.
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