–Excuse me Sir . Smoking is not allowed here .–Oh sorry. I .A. haven’t know B. don’t kn

问题补充：

–Excuse me , Sir . Smoking is not allowed here .

–Oh, sorry. I .

A. haven’t know

B. don’t know

C. hadn’t know

D. didn’t know

答案：

A. haven’t know

B. don’t know

C. hadn’t know

(答案→)D. didn’t know

解析：交际用语及时态。由语境可以为过去式。