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I wonder why they’re so late. They ______ here an hour ago.
A．should beB．might be
C．should have beenD．might have been
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John ___ such a thing about you. He never speaks ill of you behind your back.
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The headmaster suggested that a good preparation ________ ahead of time.
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The truly homeless are the rich who __    _ their home into a hotel hall．
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The boss has given everyone a special holiday, so we   go to work tomorrow.
A．can’tB．mustn’t C．needn’tD．shouldn’t

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It was strange that he _____ have uttered such rude remarks on that occasion.
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--- The research is difficult. Who do you think can do the job?
---       my students have a try?
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I ________ you would come so early.
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If you ________ make another try , I shall do everything possible to help you .
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