He ______ asleep when he was reading.

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问题 He ______ asleep when he was reading.

选项 A、was falling
B、fell
C、falls

答案B

解析 本题考查动词时态。when引导的从句用过去进行时,主句的动词若是短暂性动词,那么时态应用一般过去时。
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