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He got up so late in the morning so he ___________ working l

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He got up so late in the morning so he ___________ working late at night
A.could have been
B.must have been
C.should have been
D.would have been
但B不是“对过去的肯定推测”吗
这个好像是对未来的推测啊……
He got up so late in the morning so he ___________ working l
翻译过来是:他早上起来的这么晚,那么它肯定是昨天晚上工作到很晚了.
所以,是对过去的肯定推测 没错.