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请问比较句型中thanusual为什么不用thanusually呢?例如Harvestinghasbegunearlierthanusual.(收割工作开始得比往年要早些)为何不用thanusually呢?这里的usual明明是时间状语,为何不用副词usually呢?

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请问比较句型中than usual为什么不用than usually呢?例如Harvesting has begun earlier than usual.(收割工作开始得比往年要早些)为何不用than usually呢?这里的usual明明是时间状语,为何不用副词usually呢?
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因为这里usual修饰的是time, 相当于earlier than usual time,不能说usually time
类似的还有as usual, 例如 Harvesting has begun as usual (time).
至于usual后面指的是什么取决于上下文,as usual way/situation等,也是可以的.
用usually的情况例如,We left school earlier than we usually do. = earier than usual