I fell and hurt myself while I ________ basketball yesterday.A was playing B am

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问题 I fell and hurt myself while I ________ basketball yesterday.

选项 A was playing
B am playing
C play
D played

答案A

解析考点:动词时态。while “当……时” 引导的时间状语从句与主句的动作同时发生,因此谓语动词要选进行时,又因为从句中有yesterday,所以谓语动词过去进行时符合题意。句意:昨天我在打篮球的时候摔伤了
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