Having checked the doors were closed,and( )all the lights were off,the boy opened the door to his bedroom.

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问题 Having checked the doors were closed,and( )all the lights were off,the boy opened the door to his bedroom.

选项 A、why
B、that
C、when
D、where

答案B

解析 本题考查宾语从句的连接代词。that引导的宾语从句,若有两个或两个以上,只有第一个that可以省略。Having checked the doors were closed中省略了checked后的that。
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