Hello I you in London. How long have you been here?A. don’t know; wereB. hadn’t known;

问题补充：

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; are

D. didn’t know ; were

答案：

A. don’t know; were

B. hadn’t known; are

C. haven’t known; are

(答案→)D. didn’t know ; were

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？