问题补充：
I often practice football on Friday.
A. playing
B. to playing
C. play
D. to play
答案：
(答案→)A. playing
B. to playing
C. play
D. to play
解析：句意：我经常在星期五练习踢足球。practice doing sth练习做某事，固定结构，故选A
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