UC知道When the boy __the stotybook ,his mother __asleep.
来源：百度知道 编辑：UC知道 时间：2024/09/28 14:02:26
A.read ;fell B.was reading ;was falling C.read ;was falling D.was reading ;fell
什么时候要用ing形式？解释一下
什么时候要用ing形式？解释一下
D.was reading ;fell
C
他妈妈一直在睡觉，在男孩看故事书之前就在睡了，男孩看的时候也再睡，所以应该用进行时。而不是过去式，过去式指一个动作过去已经做完。进行时是动作还在进行中。
因为说这句话之前事情已经发生了。所以男孩的read 是过去时。妈妈的也应该用过去进行时。就是was +动词ing
C
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