oh,it's you.i'm sorry i ____ know you _____ here.

问题描述:

oh,it's you.i'm sorry i ____ know you _____ here.
A.didn't are B.didn't were

选B
I didn't know you were here.这句话是过去时,前后时态要一样.
不能前面用过去式,后面用现在式.所以引选B