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【参考答案】

改back为backs
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单项选择题
A．It’s a free country run by UNB．It’s a colony nm by USC．It’s a free land nm by its own people
A．It’s a free country run by UN
B．It’s a colony nm by US
C．It’s a free land nm by its own people
单项选择题
A．He wanted to find a job.B．He just called back.C．He had an appointment.
A．He wanted to find a job.
B．He just called back.
C．He had an appointment.
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