We were looking for you all this morning. You    office without a word.
A．mustn’t have leftB．shouldn’t have leftC．couldn’t have leftD．needn’t have left
B

試題分析: 句意：我們一上午都在找你。你不應該一聲不吭就離開辦公室。must表示推測不用于否定句，排除A選項；shouldn’t have done本不應該做（但做了）；couldn’t have done不可能做過；needn’t have done 本沒必要做，由句意可知此處表示責怪，選B。
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