问题补充:
---Are the Smiths living in the house alone ?
--- Yes, although they have three sons, of them live with their parents.
A. neither
B. both
C. all
D. none
答案:
A. neither
B. both
C. all
(答案→)D. none
解析:句意:史密斯夫妇还独自住在那个房子吗?是的,尽管他们有三个儿子,但他们没有一个和父母住在一起。A两者都不B两者都C三者或三者以上都D三者或三者以上都不,根据句意,故选D