选A tired of 表示厌倦做某事
tired from 表示身体上的疲倦
Be tired of doing sth 句式表示：厌倦做某事。所以选：a
A be tired from侧重于身体上的疲倦，如be tired from work表示工作做累了； be tired of doing sth. 侧重于精神上的厌倦，表示厌烦做某事。
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