Having checked the doors were closed,and_______all the lights were off,the boy opened the door to his bedroom.
A．whyB．that
C．whenD．where
B
that引導(dǎo)賓語從句,在從句中只起連接作用,不作任何成分,常被省略,但當(dāng)謂語后接兩個(gè)或兩個(gè)以上賓語從句時(shí),第一個(gè)that可以省略,第二個(gè)that不能省略。故選B項(xiàng)。why引導(dǎo)賓語從句意為“為什么”。when引導(dǎo)賓語從句，意為“當(dāng)……的時(shí)候”。where引導(dǎo)賓語從句意為“在……地方”。
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