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The speaker_______have arrived by now.What might have happen

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The speaker_______have arrived by now.What might have happened to him?应填
应填was supposed to 还是 is supposed to
正确形式是:
The speaker【is supposed to】have arrived by now.What might have happened to him?
=The speaker【should/ought to】have arrived by now.What might have happened to him?
=【We think 】the speaker 【should】 have arrived by now.What might have happened to him?
到现在为止,演讲者被认为应该到了.他出了什么事呢?
信息词:【by now】,表明时间是现在,即【到现在为止认为】.
祝你开心如意!