Having checked the doors were closed, and _____all the lights were off, the boy opened the door to his bedroom.
A．whyB．thatC．whenD．where
B
本題考查賓語從句的連接代詞。that 引導(dǎo)的賓語從句，若有兩個或兩個以上，只有第一個that可以省略。Having checked the doors were closed中省略了that。
【標(biāo)簽】名詞性從句
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