题干
The magic show has been on 20 minutes. It has been on 2.p.m.
A：for, since
B：in, since
C：for, for
D：since, for
答案(点此获取答案解析）
A
The magic show has been on 20 minutes. It has been on 2.p.m.
A：for, since
B：in, since
C：for, for
D：since, for
，则下列不等关系中，不能成立的是 （ ）