(单选题)

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

参考答案：B

参考解析：

考查that引导的宾语从句。句意：在检查了所有门和灯都关上了之后，男孩才进入卧室。check为及物动词，后跟宾语，the doors were closed以及all the lights were off是check后的宾语从句，all the lights were off句意和结构完整，应用从属连接词引导，而谓语后的第二个宾语从句的连词不可省略，所以应选择that，故选B。

知识点：

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