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- You must phone us every week. - Yes, I . A. must B. have to C. will D. should

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- You must phone us every week. - Yes, I . A. must B. have to C. will D. should

 - You must phone us every week.
  - Yes, I _____.
   A. must         B. have to         C. will         D. should

试题答案

C