Before we left the room the chairman made sure______the lights were turned off.A

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问题 Before we left the room the chairman made sure______the lights were turned off.

选项 A、if
B、which
C、when
D、that

答案 D

解析本题考查连词的用法。make sure后接宾语从句时，引导词一般用that，that可省略。

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