Sorry,I________you________here.How

发布时间：2020-07-26 02:43:44

Sorry, I ________ you ________ here. How long have you been here? A.don't know; wereB.hadn't know; areC.haven't known; areD.didn't know; were

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D解析导解：我现在已经知道，所以本句中的“不知道”应发生在过去，故用一般过去时．
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