I made a promise to myself this year, my first year in high school, would be different.
A. whether
B. what
C. that
D. how
网友回答
A. whether
B. what
(答案→)C. that
D. how
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。