求翻译：He didn't seen to realise that he had just arrived in a street where everything from his boots was unwelcome.He was busy rummaging in his cloak,looking for something.But he did seen to realise he was being watched,because he looked up suddenly at the cat,which was still staring at him from the other end of the street.For some reason,the sight of the cat seemed to amuse him.He chuckled and muttered,'I should have known.'是什么意思？

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