英语改错题 写出答案并说明理由the woman whom we thought to be her turned out to be her sister

whom改成who 或that，定语从句先行词不能用whom引导，如果修饰人，用who或that，如果修饰物，就用which或that，that既可以修饰人也可以修饰物。因为这句话主语是woman，所以用who或that都可以

the woman whom we thought to be turned out to be her sister

thought to be her 中把her去掉，人称代词多余

whom改为of whom