David helps his mother with the housework every Saturday for about______.

1. A.
   one and half hours
2. B.
   a half and an hour
3. C.
   an hour and half
4. D.
   one and a half hours

David helps his mother with the housework every Saturday for about____.

 　 A. one and half hours 　　　　　　　 B. a half and an hour

 　 C. an hour and half　 　　　　　　 D. one and a half hours