【单选题】【消耗次数:1】
They can’t leave until they _________ their work .
did
are doing
have done
his done
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【单选题】 They can’t leave until they _______ their work .
①  did
②  are doing
③  have done
④  his done
【单选题】 They can’t leave until they ___ their work.
①  did
②  are doing
③  have done
④  has done
【单选题】 8.They can’t leave until they ______ their work.
①  did
②  are doing
③  have done
④  has done
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④  not having done
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