题目内容


30.They ______ be at home. You see, the door is locked from the outside.
A．can’tB．mayC． mustD． mustn’t
A
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Naturally, after I tell my brother what to do, he ____ go and do the opposite．
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---Something ________ to him.
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---I thought I ____, but in fact I came in the top 10% in the class.
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