问题描述：
不定式的逻辑主语是不定式动作的承受者,所以要用被动
Wool was probably the second woven material to be used for clothes.
是不是因为to be used 的逻辑主语是wool,而该动作的承受者也是wool所以要用被动式?
Wool was probably the second woven material to be used for clothes.
是不是因为to be used 的逻辑主语是wool,而该动作的承受者也是wool所以要用被动式?
问题解答：
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