he returned home earlier than--(usual) for it was not a ordinary day.填ususlly还是usual为什么?

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he returned home earlier than--(usual) for it was not a ordinary day.填ususlly还是usual为什么?

usual.
usual可用作名词,表示“惯例、平时”
……than usual 是固定短语.类似短语还有:as usual(和往常一样)
As usual, he came back home at six. 和往常一样,他六点回到了家.