This is the key ____ the door.A.to B.of C.at D.in

题目

This is the key ____ the door.A.to B.of C.at D.in
This is the key ____ the door.A.to  B.of  C.at  D.in 选那个,最好解释下为什么

答案

to key to the door 门的钥匙,就是这样的搭配,记得就行了,没什么理由