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5.I was really anxious about you.You ___________ have left home without a word.(  )
A.mustn'tB.shouldn'tC.couldn'tD.needn't

分析 我真的为你着急.你不应该一句话不说就离开家.

解答 答案是B.本题考查情态动词辨析;mustn't禁止;shouldn't 不应该;couldn't 不能;needn't不必;根据上文的"I was really anxious about you我们真的为你着急"推断说话人责备对方"不应该"一声不吭地离开家,所以答案选择B.

点评 要在正确理解情态动词的基本含义的基础上,整体理解语境中的情感态度,做出合理的判断.

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