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题目
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They must have been here the day before yesterday,____?
A.mustn’t theyB.didn’t they C.mustn’t have theyD.had they

答案
B
解析
must have done表示对过去发生情况的肯定推测,句中带有明确的过去时间状语,故附加疑问句用“didn’t they”。
核心考点
试题【They must have been here the day before yesterday,____? A.mustn’t theyB.didn’t t】;主要考察你对虚拟语气等知识点的理解。[详细]
举一反三
—— What happened to the young trees we planted?
—— The trees______well, but I didn’t water them.
A.might growB.needn’t have grown
C.would growD.would have grown

题型:不详难度:| 查看答案
Jack _______ yet last night, otherwise he _______ me.
A.mustn’t have arrived; must have phonedB.can’t have arrived; would have phoned
C.may have arrived; need have phonedD.shouldn’t have arrived; can have phoned

题型:不详难度:| 查看答案
It’s strange that they_____nothing about this matter.
A.knowB.would knowC.knowsD.knew

题型:不详难度:| 查看答案
If you____wait a moment, I’ll go and find our manager.
A.canB.shouldC.willD.must

题型:不详难度:| 查看答案
_____he come, the problem would be settled.
A.WouldB.ShouldC.ShallD.If

题型:不详难度:| 查看答案
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