—Dave it’s dangerous to swim here. Look at the sign. —Oh I it. Thank you.A. didnt not

问题补充：

—Dave, it’s dangerous to swim here. Look at the sign.

—Oh, I it. Thank you.

A. didn notice

B. won notice

C. hadn noticed

D. don notice

答案：

(答案→)A. didn notice

B. won notice

C. hadn noticed

D. don notice

解析：句意：大卫，在这游泳危险，看标志。哦，我没注意到，谢谢你。didn notice一般过去时，won notice 一般将来时，hadn noticed过去完成时， don notice一般现在时。根据语境可知是在这儿是因为之前没有注意到标志，为一般过去时，故选A.