It's dangerous to swim here.look at the sigh.OH ,I ________notice it.didn't 还是haven't why?

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/28 03:52:30

It's dangerous to swim here.look at the sigh.OH ,I ________notice it.didn't 还是haven't why?
It's dangerous to swim here.look at the sigh.OH ,I ________notice it.
didn't 还是haven't why?

It's dangerous to swim here.look at the sigh.OH ,I ________notice it.didn't 还是haven't why?
didn't
didn't过去不知道
haven't到现在还不知道(与语境不符)