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1.---I was late for Maria's Birthday party last night.

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1.---I was late for Maria's Birthday party last night.
---I guess you should have asked when you _______ to arrive.
A,are supposed B,were supposed C,supposed
2.----oh,look!Who is that woman in red?Is that Lady GaGa?
---- oh,it ____ be her.She is holding concerts in Europe now.
A,can't B,mustn't C,shouldn't
说明那个语法点.
1.---I was late for Maria's Birthday party last night.
B
be supposed to 应该的意思
由于是昨天,过去式,所以用were
整句话是说,你本该问一下自己应该什么时候到的
A
这里是情态动词的用法
这里需要的是一个“不可能”的意思
所以用can't
mustn't是禁止,shouldn't是不应该