of my parents used to play tennis a few years ago.A. Both B. AllC. EitherD. Each

问题补充：

of my parents used to play tennis a few years ago.

A. Both

B. All

C. Either

D. Each

答案：

(答案→)A. Both

B. All

C. Either

D. Each

解析：句意：几年以前，我的父母都常常打网球。Both两者都；All表示三者以上都；Either表示两者中任何一个；Each每一个。