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。
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