it took me_____to finish my math homework yesyerday.A.two hours of a half B.two and a half hours

问题描述:

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

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.