题干
23. You were late again this morning! You ______ have been here earlier. We were about to start without you.
A：should
B：ca
C：must
D：Will
答案(点此获取答案解析）
A
A：should
B：ca
C：must
D：Will
在两坐标轴上的截距都是非负整数的直线有多少条 （ ）