（）that the electricity is turned off and the windows are shu

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（）that the electricity is turned off and the windows are shut.
A Make sure B Making sure
为什么不选B,求详细解答

答案：A.

翻译：务必关掉电源和窗户.

从句子结构来看,that the electricity...and the windows are shut是两个并列的宾语从句,充当主句的宾语.
这样,主句如果要成为一个句子的话,则必须使用祈使句结构,即以动词原形make构成的短语make sure做谓语,其后是其宾语（即that引导的宾语从句）.
如果选B,则动名词making sure做主句主语的话,那么主句谓语就缺少了,也就无法构成一个句子.

再问：可以用made sure吗？
再答：不可以。祈使句是以动词原形开始的，而不能使用过去式或过去分词。

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