Hello! I ______ you were in London. How long have you been here?

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问题 Hello! I ______ you were in London. How long have you been here?

选项 A、don’t know
B、hadn’t known
C、didn’t know
D、haven’t known

答案C

解析本题考查的是时态。从句中谓语动词为一般过去时were，可知主句中谓语动词要用一般过去时或一般现在时。分析题意可知，“我不知道你在伦敦”这个事实发生在双方此刻的交谈之前，主句谓语动词应使用一般过去时。故C正确。

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