问题
选择题
At horse races, everyone has already studied the form (类型) of the horse______.
A．behind time
B．in progress
C．in advance
D．in time
答案
答案：C
题目分析：句意：在赛马中，每一个人都提前研究马的类型。behind time晚；in progress进行中；in advance提前；in time及时，所以选C。