题目内容

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

[  ]

A.can't
B.couldn't
C.are able to
D.mustn't
答案:B
解析:

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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