one hour and a half 与 an hour and a half的区别,还有后面的谓语动词到底该用单还是复?语法书上用单,牛津高阶上的例句是：One and a half hours are allowed for the exam./ An hour and a half is allowed for the exam.语法书上的例句是：One and a half apples is left on the table.此问题已使我吃不香睡不好了!还有就是two and a half 后面的谓语动词用单还是复数呢?
问题描述：
one hour and a half 与 an hour and a half的区别,还有后面的谓语动词到底该用单还是复?
语法书上用单,牛津高阶上的例句是：One and a half hours are allowed for the exam./ An hour and a half is allowed for the exam.语法书上的例句是：One and a half apples is left on the table.此问题已使我吃不香睡不好了!还有就是two and a half 后面的谓语动词用单还是复数呢?
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