题目内容

The boys ________ help laughing when they heard the funny story.


  1. A.
    can't
  2. B.
    couldn't
  3. C.
    are able to
  4. D.
    mustn't
B
can't help doing“禁不住做某事”.本句中用can的过去时could.本句句意:男孩们听到这个笑话禁不住乐了起来.
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