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
人气：319 ℃ 时间：2020-04-14 12:58:29
解答
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
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