摘要： 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 答案 B 解析 句意为:确保门关上了.且所有的灯都关上了之后.那个男孩打开门进了他的卧室.checked后跟了两 个宾语从句.第一个从句的引导词that省略了.

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