问题: 一道两难选择题
Hello !!I ____ you ____in London.How long have you been here ?
A don't know,were B hadn't know ,are
C haven't know ,are D didn't know ,were
我觉得在A 和D之间难以取舍，感觉D按语法好像对“我过去不知道你在伦敦”但按语感又觉得A对,希望老师和朋友们帮忙解答一下，谢谢！！！
解答:
D对.现在已经知道"你"在这了.I didn't know/I forgot/I thought/ I didn't recognize都如此.如: What's your name? My name is John. Sorry, I forgot.(现在知道了,但问之前忘了.)
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