don’t know ,didn’t know ,hadn’t known ,are,were,am — Hello! I_______ you _______ in London . How long have you been here?

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问题 don’t know ,didn’t know ,hadn’t known ,are,were,am
— Hello! I_______ you _______ in London . How long have you been here?

选项

答案didn’t know,were

解析 根据句意可知,在说话之时,说话人已经知道对方在伦敦了,这句话指的是说话之前“我”不知道对方在伦敦,所以只能用过去体表示。答案为didn’t know,were。
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