【单选题】【消耗次数：1】
He used to in a small village, but now he has been used to in the big city.
①
live, living
②
live, live
③
living, living
④
living, live.
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②
<img src=https://huaweicloudobs.ahjxjy.cn/4A57B745971DF167C17F84A72C04C54D.png title=)MK4YQ}EWJ~9VF{[7X5T(GP.png alt=)MK4YQ}EWJ~9VF{[7X5T(GP.png/>
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必要条件
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充分必要条件
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③
<img src=https://huaweicloudobs.ahjxjy.cn/CEBD0B2F270C7F4C3F13543CEDCA11D7.png title=G1%]H~@WJJA3L%K`P`~%(Q2.png alt=G1%]H~@WJJA3L%K`P`~%(Q2.png/>
④
不存在