One of the students hasn’t prepared lessons very well.A. one’sB. onesC. theirD. his

问题补充：

One of the students hasn’t prepared lessons very well.

A. one’s

B. ones

C. their

D. his

答案：

A. one’s

B. ones

C. their

(答案→)D. his

解析：代词辨析。one’s某人的； ones泛指一些人和物；their他们的；his他的。句意：学生中的一个人准备的功课不是很好。故选D。