【单选题】【消耗次数：1】
I was caught up ___________ conversation with a friend when someone knocked at the door.
①
in
②
at
③
over
④
off
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stare
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①
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②
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③
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①
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②
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③
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④
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①
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②
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③
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④
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①
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②
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③
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②
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③
深圳市人民代表大会制定的《深圳经济特区注册会计师条例》
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中国人民银行制定的《人民币银行结算账户管理办法》