题目内容：

——Are Mr. and Mrs. Wang living alone in the house? ——Yes,altough they have three sons,( ) o
——Are Mr. and Mrs. Wang living alone in the house?
——Yes,altough they have three sons,( ) of them live with their parents.
A.neither B.both C.all D.none

优质解答

D.none
三个以上用,none