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You didn't use to travel by plane ,did you

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You didn't use to travel by plane ,did you
No,but now as a businessman,I____to flying one country to anther .
A.am already used
B.have already used
问:为什么不是B?
You didn't use to travel by plane ,did you
e used to doing sth 习惯于做……
B应该是have been used
再问: am already used 是什么意思?
再答: 我已经习惯了从一个国家飞到另外一个国家。