25.He got up so late in the morning so he ___________ workin

25.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
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binghan5 幼苗

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B.must have been must have done 表示对过去发生动作的肯定推测 a could只用于否定推测 c 该做而未做 d 用于虚拟语气

1年前

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