Having checked the doors were closed,and_______all the lights were off,the boy o
题型：不详难度：来源：
| Having checked the doors were closed,and_______all the lights were off,the boy opened the door to his bedroom. |
答案
| B |
解析
| that引导宾语从句,在从句中只起连接作用,不作任何成分,常被省略,但当谓语后接两个或两个以上宾语从句时,第一个that可以省略,第二个that不能省略。故选B项。why引导宾语从句意为“为什么”。when引导宾语从句，意为“当……的时候”。where引导宾语从句意为“在……地方”。 |
举一反三
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It is reported that two schools,____are being built in my hometown,will open next year.| A．they both | B．which both | | C．both of them | D．both of which |
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