【问】 It will take________ to finish this course.

A. one and a half year's time B. a year and a half's time

C. a year and a half of time D. a year and a half time.

我知道正确答案为B(a year and a half’s time)。我的问题是：为什么不能选A?

【答】 one and a half后面的名词应当使用复数(见one and a half... is/are)。A项中的year’s是year的单数所有格形式。