一个很难的英语单选题---高手帮忙啊

题目

一个很难的英语单选题---高手帮忙啊
64、Having checked the doors were closed,and _____ all the lights were off,the boy opened the door to his bedroom.
A：why B：that C：when D：where
说是宾语从句,我有些乱了.

答案

很简单,all the lights were off作了check的宾语啊,跟的是双宾语,你翻译一下就立刻懂了,小男孩检查过门和所有灯都已关好,就打开了卧室门.