Tony hurt his arms while______basketball in today’s class.

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问题 Tony hurt his arms while______basketball in today’s class.

选项 A、he played
B、playing
C、play
D、played

答案B

解析 while在用作“当……的时候”时,其后从句应该使用进行时态;同时在时间状语从句中,假如从句主语与主句主语一致且谓语动词出现助动词be时,可同时省略主语和助动词be。故playing符合题意为he was playing的省略。
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