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"Larry,I can't give you an answer ____ I think it over," sai

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"Larry,I can't give you an answer ____ I think it over," said Joe.(when before after until)
应该选before
首先排除after,如用after后面应改为“I thought it over”,表示“想过以后”应用过去时态;when表示“当……时候”,用在此处句意不通顺;最易错选的是unti,“not…until”表示“直到(某时)(某动作)才(发生)”,not…until 用在否定句中,谓语动词通常是瞬间性动词,如open, start, leave, arrive, finish, stop等,强调主句动作开始的时间,think不是瞬间动词.故选before,句意为:拉里,在我仔细考虑之前,我不能给你答复.
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