I made a promise to myself _______ this year, my first year in high school, would be different.

A．whether

B．that

C．what

D．when

孟子曾用“金声玉振”来形容孔子的思想：“金声（奏乐开始）也者，始条理也；玉振（奏乐结束）之也者，终条理也。”主要指孔子思想（   ）

A．集先贤古圣之大成

B．以“乐”为核心

C．能陶冶人的性情

D．对后世产生深远影响