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题目内容
（华北水利水电大学英语）
He begaworking with balloons______________.
·as a relaxatiofrom his work oaircraft
·as part of his job at the time
·as a hobby
·whehe heard that some Americans had crossed the Atlantic ione
·as a relaxatiofrom his work oaircraft
·as part of his job at the time
·as a hobby
·whehe heard that some Americans had crossed the Atlantic ione
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