The boy always stays there for___

问题描述:

The boy always stays there for___
a.one and half hour
b.one and a half hour
c.one and half hours
d.one and a half hours

选D.
(one and a half) hours 一个半小时(超过了一个,所以用hour的复数)
或者 (one hour )and a half (这时就不用复数了,因为前面是one hour “再加”a half )