--This is no-smoking zone. Cant you see the sign?--Oh sorry. I it. A. havent seenB.

问题补充：

--This is no-smoking zone. Can you see the sign?

----Oh, sorry. I it.

A. haven seen

B. won see

C. don see

D. didn see

答案：

A. haven seen

B. won see

C. don see

(答案→)D. didn see

解析：句意：这是无烟空间，难道你们看到标志吗？回答，对不起，我刚才没看到。强调刚才的动作用过去式，结合句意，故选D