（）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

（）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
（）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

（）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.