问题标题:
It'sdangeroustoswimhere.lookatthesigh.OH,I________noticeit.didn't还是haven'twhy?
问题描述:
It'sdangeroustoswimhere.lookatthesigh.OH,I________noticeit.
didn't还是haven'twhy?
鲁德海回答:
didn't
didn't过去不知道
haven't到现在还不知道(与语境不符)
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