Now that the light went out,he_______have slept. a.ought to b.must c.would d.should 选啥？为啥？

Now that the light went out,he_______have slept. a.ought to b.must c.would d.should 选啥？为啥？

Now that the light went out,he_______have slept. a.ought to b.must c.would d.should 选c. 因为must have done是对过去的事的肯定判断

Now that the light went out, he must have slept..
must_有道词典
must
英 [mʌst]
美 [mʌst]
aux. 必须，一定；可以，应当；很可能
n. 绝对必要的事物；未发酵葡萄汁
n. (Must)人名；(匈)穆什特；(俄、瑞典)穆斯特
更多释义>>
[网络短语]
Must 必须,务必,在口语中表猜测
Must not 切不可,不允许,不准
Must see 一定要看,必看,不可不看

a
灯灭了，应该是睡了，表示合理推测

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