Question

() 7. My sister wear a uniform on weekends.

   A. don't have to   B. doesn’t have to

   C. haven’t to   D. doesn’t have

Answer 1

7. B have to意为“不得不”，有时态的变化，变否定句 =时，需要加相应的助动词。本句为一般现在时且主 =语为第三人称单数，所以用助动词doesn’t。