it took me_____to finish my math homework yesyerday.A.two hours o_英语解答

it took me_____to finish my math homework yesyerday.A.two hours of a half B.two and a half hours
能说一下为什么吗

人气：390 ℃　时间：2019-08-20 10:16:58

解答

选择B.
two and a half hours 意思是：两个半小时
= two hours and a half
所以A不对.