Tony hurt his arms while______basketball in today’s class.A、he playedB、playing

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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，如果从句主语与主句主语一致且从句的谓语动词出现助动词be时，从句中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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