One and a half bananas has rotted away.

One and a half bananas has rotted away. 急One and a half bananas has rotted away.为何banana 用复数,而后面用has one and a half bananas后接单还是复数 "one and a half bananas"谓语为什么用单数? I want to buy one and a half kilos of bananas.(改同意句) One and a half bananas?left on the table.处填什么? one and a half day /one and a half days one and a half apples one kilo and a half 关于one and a half one + 名词 + and a half one and half还是one and a half