They must have been here the day before yesterday,＿＿＿＿? A．mustn’t theyB．didn’t t

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They must have been here the day before yesterday,＿＿＿＿?

A．mustn’t they

B．didn’t they

C．mustn’t have they

D．had they

答案

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”。

举一反三

—— What happened to the young trees we planted?
—— The trees＿＿＿＿＿＿well, but I didn’t water them.

A．might grow	B．needn’t have grown
C．would grow	D．would have grown

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Jack _______ yet last night, otherwise he _______ me.

A．mustn’t have arrived; must have phoned	B．can’t have arrived; would have phoned
C．may have arrived; need have phoned	D．shouldn’t have arrived; can have phoned

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It’s strange that they＿＿＿＿＿nothing about this matter.

A．know

B．would know

C．knows

D．knew

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If you＿＿＿＿wait a moment, I’ll go and find our manager.

A．can

B．should

C．will

D．must

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＿＿＿＿＿he come, the problem would be settled.

A．Would

B．Should

C．Shall

D．If

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