题干
— You should be on time tomorrow. There is no______ for being late again.
—OK, I will.
A：excuse
B： need
C：time
答案(点此获取答案解析）
A
— You should be on time tomorrow. There is no______ for being late again.
—OK, I will.
A：excuse
B： need
C：time
，
，
，延长
，使
，连结
，求证:
.
是 三角形；
，且