题目内容

At proper horse races everyone has already studied the form of the horse ______.
A.behind timeB.in progressC.in advanceD.in time
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。
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