The items she set down helped him find the highway (to study
3个回答

这里the highway to意思是.的途径,方法,道路,to是介词

用法是the highway to后面跟名字或者动名词都可以

所以本句的主要结构其实是

The items helped him find the highway.

如果按你说的后面跟原型的话,变成了

The items helped him find the highway to do.

另外举个例子:I find a pear to eat.我找到一个梨用来吃.

find sth to do.可以理解为是找到了某物,并把他用来.

放你那句句子里面就不通了

很难说明白.还是靠语感吧