分类：教育/科学-学习帮助
问题：QuestionHegiavemethefirewoodin__ 
He giave me the firewood in ____ for the food I offer himA changeB exchangeC relpaceD trade说明一下理由，谢谢~~
回答：B exchange

in exchange for 固定短语， 交换, 以此易彼
A change改变变化，C relpace代替取代，D trade贸易 生意均无这样的搭配。