They have to work at once, ________?


  1. A.
    can they
  2. B.
    can't they
  3. C.
    don't they
  4. D.
    haven't they
C
解析：
變反意疑問(wèn)句，前句是肯定后句用否定，且have to的否定式為don't have to。
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