Sorry, I ________ you ________ here. How long have you been here?
A.don'tknow;wereB.hadn'tknow;areC.haven'tknown;areD.didn'tknow;were...
A. don't know; were
B. hadn't know; are
C. haven't known; are
D. didn't know; were 展开
B. hadn't know; are
C. haven't known; are
D. didn't know; were 展开
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