问题补充：
—Look at the sign. It says “No Parking”.
----.
A. Sorry, I don’ t see it
B. That’s all right
C. That’s OK.
D. Sorry, I didn’t see it.
答案：
A. Sorry, I don’ t see it
B. That’s all right
C. That’s OK.
(答案→)D. Sorry, I didn’t see it.
解析：本题中使用一般过去时，表示是过去没看见！故选D
