the old lady has three sons,(),luckily for her,works as a do
the old lady has three sons,(),luckily for her,works as a doctor.A.none of whom the old lady has three sons,(),luckily for her,works as a doctor. A.none of whom B.one of whom C.either of whom D.all of whom
你好这里选B 按照句意理解,这个女士有三个孩子,幸运的是,其中一个是医生. A是没有人是医生,与幸运的相矛盾,所以A错 C,either of 是两个中的任意一个,这里有三个儿子,所以错 D,all of 是三个儿子都是医生,但是后面的谓语动词works告诉我们,这里是第三人称单数,所以D也错. 只能选B