问题
选择题
At proper horse races everyone has already studied the form of the horse ______.
A．behind time
B．in progress
C．in advance
D．in time
答案
C
考查词组辨析：. in progress 在进行中， in advance提前， in time迟早，及时，句意是：在赛马比赛中，每个人已经提前对马的情况做了研究。选C。