问题
Haven’t you heard of a person called Zhang Cunhao—____________. He is a famous scientist and won the 2014 Top Science and Technology award.
A:three hours and a half
B:three and a half hour
C:three and a half hours
D:A&C;
B:three and a half hour
C:three and a half hours
D:A&C;
正确答案是：
