Kate can’t come to your birthday party, because she ______ babysit her sister. [ ]

A. should        

B. would like      

C. may          

D. has to

电信用户出现异常的巨额电信费用时，电信业务经营者一经发现，应当尽可能迅速告知电信用户，并可以采取相应的措施。