It is dangerous to swim here oh ,I ------it .Thanks for telling me .

问题描述:

It is dangerous to swim here oh ,I ------it .Thanks for telling me .
A haern"t noticed B won"t notice
C don"t notice D didn"t notice

D didn"t notice 为正确选项.
说话时,notice的动作已经成为过去,故用一般过去时noticed.