What is the missing word What could be a correct word to replace "x" in the question?

你要换这个东西 "X" 那个吗？
(Do you want to exchange this for that?)
I am come from Taiwan.
我來自台灣
In traditional,If the clerk want to check your request that you want to replace!
They always said:"請問你要把"A"換成"B"嗎?"
傳統上,如果店員要確認你換貨的需求.他們會說:"請問你要把"A"換成"B"嗎?"

Do you want to exchange this for that?
(你想要把這個東西和那個東西(交換/取代)嗎?)
你要换这个东西 "X" 那个吗？
參考答案:
你要换这个东西 "成為" 那个吗？