题目内容

---Would you come to my birthday party tomorrow evening?

---I’m afraid I ______. I have to look after my sister.

  A. wouldn’t    B. can’t        C. won’t        D. mustn’t

B

【解析】情态动词的用法。根据答语句意“I have to look after my sister.”可知是去不了的,故选B。

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