As he was so tired he soon fell_.A.slept B.asleep c.sleep d.sleeping 选哪个?为什么?

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Ashewassotiredhesoonfell_.A.sleptB.asleepc.sleepd.sleeping选哪个?为什么?Ashewassotiredhesoonfell_.A.sleptB

As he was so tired he soon fell_.A.slept B.asleep c.sleep d.sleeping 选哪个?为什么?
As he was so tired he soon fell_.A.slept B.asleep c.sleep d.sleeping 选哪个?为什么?

As he was so tired he soon fell_.A.slept B.asleep c.sleep d.sleeping 选哪个?为什么?
.asleep
fall asleep入睡

B是过去进行时,进行时时表示的短暂的一个时间,基本上就是一个瞬间的过程
A是表示一个漫长的过程