问题描述：
can not help but后面接什么
When I told him the joke. He _____
a.could not help to laughing
b.could not help to laugh
c.could not help but laughing
d.could not help but laugh
When I told him the joke. He _____
a.could not help to laughing
b.could not help to laugh
c.could not help but laughing
d.could not help but laugh
问题解答：
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