1.a/ an + 单名+ or two " 大多接单数谓语：
e.g.
Only one student or two is absent.只有一两个学生缺席.
2."one or two + 复名"接复数谓语.
one or two students are absent.只有一两个学生缺席.
3.two books or three 接复数谓语