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

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It''sdangeroustoswimhere.lookatthesigh.OH,I________noticeit.didn''t还是haven''twhy?It''sdangeroustoswimher

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)