----We are going to play a football game Class 3 this Sunday.----I will cheer for you. I

问题补充：

----We are going to play a football game Class 3 this Sunday.

----I will cheer for you. I hope our class will win.

A. for

B. to

C. against

D. of

答案：

A. for

B. to

(答案→)C. against

D. of

解析：句意：我们这个星期天打算去和3班踢一场足球赛。我会为你们加油的。我希望我们班赢。Play against意为“与……打对抗赛”，故选C。