My father enjoys very much. He often practises in summer.A. to swim; swimmingB. swimming

问题补充：

My father enjoys very much. He often practises in summer.

A. to swim; swimming

B. swimming; swimming

C. to swim; to swim

D. swimming; to swim

答案：

A. to swim; swimming

(答案→)B. swimming; swimming

C. to swim; to swim

D. swimming; to swim

解析：句意：我的父亲非常喜欢游泳。他常常在夏季练习游泳。动名词做宾语表示抽象动作，结合语境可知选B。