问题补充:
---Don put the waste on the ground.
---Oh, Im very sorry. I the dustbin(垃圾箱) there.
A. don see
B. isn seeing
C. didn see
D. haven seen
答案:
A. don see
B. isn seeing
(答案→)C. didn see
D. haven seen
解析:考查时态:句意:--别把垃圾扔在地上。--哦,对不起,我没看见这里的垃圾箱。说明刚刚没看见垃圾箱,用一般过去时。选C。