单选题I made a promise to&

问题补充：

单选题Imadeapromisetomyself_____thisyear,myfirstyearinhighschool,wouldbedifferent.A.whetherB.whatC.thatD.how

答案：

C解析考察同位语从句。That引导同位语从句that this year, my first year in high school, would be different.解释promise的内容。故C正确。