正确答案为：
to cross
help sb (to) do sth 帮助某人做某事
help 后面可以跟动词原形,也可以跟带to的动词不定式,两者是一样的
所以这里填写 to cross
看,这个学生正在帮老人过马路.
look!the student is helping the old man cross the road
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