e afraid of sth 害怕某物、某事 be afraid of doing sth .害怕会出现某种情况
be afraid on 不是固定搭配,介词on应该和后面的词相搭配的
be afraid to do sth.害怕做某事
be afraid at 因...而害怕
be afraid of be afraid on be afraid to be afraid at 的区别
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