he_asleep when there_aloud knock at the door. A was just falling ;was D just fell;was请问为什么不能选D .语法没错吧?谢谢了帮我解决下

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he_asleepwhenthere_aloudknockatthedoor.Awasjustfalling;wasDjustfell;was请问为什么不能选D.语法没错吧?谢谢了帮我解决下he_as

he_asleep when there_aloud knock at the door. A was just falling ;was D just fell;was请问为什么不能选D .语法没错吧?谢谢了帮我解决下
he_asleep when there_aloud knock at the door. A was just falling ;was D just fell;was
请问为什么不能选D .语法没错吧?谢谢了帮我解决下

he_asleep when there_aloud knock at the door. A was just falling ;was D just fell;was请问为什么不能选D .语法没错吧?谢谢了帮我解决下
when 前面表示的是一个睡着的状态 属于时间段 如选D fell asleep 则是一个瞬间动词,应该用现在进行时表示一个状态