12、Having said goodbye to his friends, he         for Paris and         to do his research.

A．set off; set out  B．set about; set out     C．set off; set about     D．set out; set off

12、A

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Having said goodbye to his friends, he         for Paris and         to do his research.

A．set off; set out  B．set about; set out     C．set off; set about     D．set out; set off

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