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
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(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。