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 我真的為你著急．你不應(yīng)該一句話不說就離開家．

解答 答案是B．本題考查情態(tài)動詞辨析；mustn't禁止；shouldn't 不應(yīng)該；couldn't 不能；needn't不必；根據(jù)上文的"I was really anxious about you我們真的為你著急"推斷說話人責(zé)備對方"不應(yīng)該"一聲不吭地離開家，所以答案選擇B．

點評 要在正確理解情態(tài)動詞的基本含義的基礎(chǔ)上，整體理解語境中的情感態(tài)度，做出合理的判斷．

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