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 句意: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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