I suppose that it is because the complete expression is "as it is usual". Sextus Edit: I mean, "as usual" certainly derives from "as it is usual".
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01cite10CalifJim12cite10"as usual" is a fixed expression.12br10please let me know the difference between 'many a ti
10Sometimes there isn't a good reason why certain expressions are used. The reason is often lost in history, if there ever was one.12br
10CJ12br
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