-I can't walk any longer, Mum．

-Why?________, dear?


  1. A.
    What has happened
  2. B.
    What did you happen
  3. C.
    What have you happen
  4. D.
    What is happened to you
A
happen是不及物動詞，沒有被動語態(tài)，D項可以排除．happen的主語往往是物，而不是人，表示“某人發(fā)生了某事”要用sth happen to sb這種結(jié)構(gòu)．
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