I have four .A. tennis racketB. tennis racketsC. rackets tennis D. racket tennis

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A. tennis racket
(答案→)B. tennis rackets
C. rackets tennis
D. racket tennis
解析：本句的含义为我有4个网球拍，tennis racket是可数名词，其复数形式是tennis rackets，故本题选B。