The boys arrived at school_____late.A.half an hour.B.one hour C.two hours选哪个
问题描述：
The boys arrived at school_____late.A.half an hour.B.one hour C.two hours选哪个
答
选b
一个半小时（即90分钟）,有多种表达方式：one and a half hours,one hour and a half或者an hour and a half都可以.因为一个半小时超过了一个小时,所以one and a half后面跟复数hours,而one后面是hour,加单数,加上 and a half.