Question

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

[　　]

A． don't know, were

B． hadn't known, are

C． haven' t known, were

D． didn't know, were

Answer 1

答案：D
提示：

是以前不知道的事情，而现在知道了，所以应说didn't know，所以只有D正确。