His head turns to one side as was his habit.
这里as看成是一个非限制性定语从句的话,为什么没有逗号啊?
试比较, his head turns to one side, as was his habit.
因为本句as从句作方式状语,就像老习惯那样,他的头偏向一侧。方式状语不用逗号隔开。
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