He slept well ____ the door open .A.when B.while C.because D.with

题目

He slept well ____ the door open .A.when B.while C.because D.with
为什么选D,请详解,

答案

D with the door open 让门开着.
the door open 是一个短语,用介词引导,
其他三个选项都是连词,不能直接加短语,排除