单选题
Before we left the room the chairman made sure ______ the lights were turned off.
A、
if
B、
which
C、
when
D、
that
【正确答案】
D
【答案解析】
[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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