-WhendidyoufirstvisitNewYork?-Ithinkit_______in1978.A.mustbeB.shouldhav

发布时间：2020-08-04 22:53:47

-When did you first visit New York?-I think it _______in 1978.A.must beB.should have beenC.may beD.must have been

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D解析(1)[must + have + 过去分词] 表示对过去肯定的推断
I must have fallen asleep when the telephone rang last night.
(2) [can + have + 过去分词] 表示对过去的推理(用在疑问句中)
[cannot + have + 过去分词] 表示对过去否定的推理。
类例: ① She cannot have said such a foolish thing.
② Can he have said so? (他可能这样说吗?)
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