Hi Bill. I you in this city. How long have been here?A. didn’t know; were B. don’t kow;

问题补充：

Hi, Bill. I you in this city. How long have been here?

A. didn’t know; were

B. don’t kow; are

C. haven’t known; are

D. don’t know; were

答案：

(答案→)A. didn’t know; were

B. don’t kow; are

C. haven’t known; are

D. don’t know; were

解析：考查时态。句意：嗨，比尔。我不知道你在这座城市。到这儿多久了？结合语境可知前文无论主从句描述的都是过去动作或状态，故用一般过去式，选A。