Question

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

1. A.
   don’t know; were
2. B.
   hadn’t known; are
3. C.
   haven’t known; are
4. D.
   didn’t know ; were

Answer 1

D
解析：
考查时态。根据句意我现在已经知道你在伦敦了，那么我不知道你在伦敦是过去不知道。所以所以过去时。句意：你好，我不知道你来伦敦了。那么在这里多久了？