didn't
didn't过去不知道
haven't到现在还不知道(与语境不符)
It's dangerous to swim here.look at the sigh.OH ,I ________notice it.
It's dangerous to swim here.look at the sigh.OH ,I ________notice it.
didn't 还是haven't why?
didn't 还是haven't why?
英语人气：564 ℃时间：2020-04-01 16:38:25
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