题干
When you break the rules, you should ___ to your teacher.
A：apologise
B：introduce
C：expect
D：compare
答案(点此获取答案解析）
A
When you break the rules, you should ___ to your teacher.
A：apologise
B：introduce
C：expect
D：compare
的前
项和为
，若
，则
（ ）